If a precipitate is identified as a water-insoluble compound, it will always be: a) a colorless...
Question:
If a precipitate is identified as a water-insoluble compound, it will always be:
a) a colorless liquid
b) insoluble in water each time it is found in water
c) a gas
d) the product of a reaction
e) a substance whose color has changed
Compound:
A compound is made of two or more different elements. Compounds contain the different elements in a fixed ratio. For example, water is a compound that is made of hydrogen and oxygen in 2:1.
Answer and Explanation: 1
Become a Study.com member to unlock this answer! Create your account
View this answer
When one reactive element reacts with another compound, then the less-reactive element gets substituted by the more-reactive element. Overall, the...
See full answer below.
Ask a question
Our experts can answer your tough homework and study questions.
Ask a question Ask a questionSearch Answers
Learn more about this topic:
Get access to this video and our entire Q&A library
Precipitation Reactions: Predicting Precipitates and Net Ionic Equations
from
Chapter 10 / Lesson 9
128K
Study precipitate reactions. Determine precipitate solubility according to solubility rules. Learn to write ionic equations by following a molecular reaction.
Related to this Question
- A Precipitate is: a. A solid formed from a chemical reaction b. A rocky edge c. A substance dissolved in a liquid e. A change in solution colour during a chemical change
- An unknown sample does not react with 2,4-dinitrophenylhydrazine reagent, but a color change is observed on reaction with ceric nitrate reagent.
- An unknown sample produces a reddish precipitate upon reaction with 2,4-dinitrophenylhydrazine reagent, no color change with Schiff's reagent, and a yellow precipitate when mixed with iodine and base.
- In an experiment, two clear liquids are combined in a beaker. A white precipitate (solid) forms and the temperature in the beaker rises. Which of the following best explains what happened? a. The chemical identity of the substances involved was not change
- An unknown solution gave a red flame and no precipitate with any of the reagents in the solubility test. The halide test gave a faint yellow color. Write the name and formula of the dissolved substance in the unknown solution.
- A scientist is working with an unknown substance named X. He adds some of this substance to a beaker of water and discovers that substance X fails to dissolve in water. The particles remain mixed with the water when motion is applied but settle out when l
- A student examined an unknown compound. He found that the compound was insoluble in water, but soluble in 5% NaOH and 5% NaHCO_3. Based on the results of the solubility tests, he was sure his unknown
- When a metal is placed in water, what is experimental evidence that a reaction occurred? A. pink color of solution upon addition of phenolphthalein B. bubbles C. a solid precipitate forms D. both A and B E. none of the above; metals do not react with wate
- An unknown sample containing one or more Group I ions is analyzed. The initial precipitate is extracted with hot water; treatment of the supernatant solution with K_2CrO_4 yields a yellow precipitate. Treatment of the remaining Group I precipitate with N
- Two colorless solutions are mixed in a stoppered flask. As the reaction proceeds, the resulting solution turns red, and a colorless gas is formed. After a few minutes, no more gas is evolved but the r
- A piece of copper is immersed in a solution of oxygenated water. What would you expect to observe as this reaction proceeds? a. a precipitate forms b. a gas is produced c. a blue color appears in the solution d. the blue color in the solution disappears
- Mercury(II) oxide is an orange-red solid with a density of 11.1 \frac{g}{cm^3}. It decomposes when heated to give mercury and oxygen. The compound is insoluble in water (does not dissolve in water). Identify the physical and the chemical properties of mer
- An unknown carbohydrate solution tested positive for the Molisch reagent, had no reaction with I_2, produced a red precipitate within 2-3 minutes with the Barfoed reagent, turned cherry red with the Seliwanoff reagent and produced a muddy brown-gray produ
- It is suspected that a water-insoluble solid unknown is an amine. Which of the following would be useful in confirming the suspicion? (a) 6 M HCl solution (b) 3 M NaOH solution (c) Red litmus paper
- If a colorless liquid with a pungent odor is added slowly to another colorless liquid, a dark brown precipitate is produced that later dissolves to produce a colorless solution. What are the two colorless liquids?
- A student was assigned a colorless unknown. The student added five drops of 1.0 M barium chloride solution to 1.0 mL of the unknown solution. A white precipitate formed. In a second experiment, the student added two drops of 0.5 M NH3 solution to 1.0 mL o
- It is suspected that a water-insoluble solid unknown is an amine. Which of the following would be useful in determining the validity of the suspicion? a. 6 M HCl solution b. 3 M NaOH solution c. Red litmus paper
- How would the observed timing for precipitate formation change if 2-chlorobutane was subjected to silver nitrate in 1:1 ethanol:water (as opposed to 100% ethanol) ?
- A student was asked to identify a compound. In an effort to do so, he first dissolved the compound in water. He found that no precipitate formed when hydrochloric acid was added, but when H2S was bubbled into this acidic solution, a precipitate formed. Wh
- Identify these unknown organic compounds: 1. Bromine water Test: The bromine color persists after the first two drops 2. Hinsberg Test: No observable precipitate formed. On acidification, no change was observed 3. Nitrous acid test: No change at all w
- The active ingredient in Milk of Magnesia^TM is Mg(OH)_2. Magnesium hydroxide is insoluble in water, so the product is a mixture of water, flavoring, and other ingredients to suspend the solid Mg(OH)_
- A solution containing an ionic compound is subjected to the anion and cation confirmation tests, providing the following results: Addition of silver nitrate: a bright yellow precipitate formed Flame test: a purple color was observed Identify the ionic com
- When two solutions are mixed and a new color is observed, is this color change an indication that a chemical reaction has occurred? Explain.
- A solution containing an ionic compound is subjected to anion and cation confirmation tests, providing the following results. Addition of silver nitrate: a bright yellow precipitate formed Flame test: a purple color was observed Identify the ionic compoun
- You are given a beaker of water. You pour an ionic compound into the water and stir for several minutes. Most of the ionic compound dissolves, but some of the solid settles to the bottom of the beaker. This mixture would be correctly classified as a solut
- Metals bond with halogens to form colorless metal halides. During an experiment, bromine water was added to a solution of potassium iodide. A record of the experiment is shown. Reactants color: Br2 = light orange solution, KI = colorless solution Color of
- In an experiment using fertilizer, the gravimetric method is used. The reaction solution is tested with litmus paper to determine when a solution has become basic enough that it will be able to precipitate. NH3 is added until the red litmus paper turns bl
- A 1.0-mL volume of 0.010 M H_2SO_3 is added to a mixture of 12 drops of 0.010 M HIO_3, 8 drops of deionized water, and 1 drop of starch solution. A color change occurred after 40 seconds. Assuming 25
- A drop of blue ink is introduced to the bottom of a beaker containing water. It is observed that all of the water in the beaker turns blue after some time. Name the process that took place.
- Is it always possible to classify a substance as either ionic or molecular on the basis of the color of its solution (assuming it dissolves in water). Why or why not?
- Identify these unknown organic compounds: 1. Silver Nitrate test: test with Nitric acid: The reaction mixture remains unchanged 2. Basic Hydrolysis Test: There was no change in the mixture after 2 hours of heating 3. Basic Hydrolysis: Test for ammonia:
- Predict which pure substance has the following chemical and physical properties: white solid at room temperature, high melting point, soluble in water, highly conductive when dissolved in water, react
- In a dry evaporating dish, 7.50 g solid copper (II) sulfate pentahydrate was dissolved in 30.0 ml of deionized water at 60.0^\circ C. While stirring slowly 1.23 g of iron powder was added to the solution. The solution was allowed to sit for 10 minutes an
- An unknown liquid was mixed with water, and two layers formed. When a blue solution of CuSO4 was added and mixed, the top layer was colored blue. A fresh sample of the same unknown froze in dry ice, a
- An unknown liquid (A) showed no IR absorption between 1500 and 2500 cm^{-1}. Similarly there was no absorption above 3000 cm^{-1}. Compound A reacted with alcoholic silver nitrate to give cloudiness after serval minutes and it also reacted with sodium iod
- When blue food coloring is dissolved in water, the result is a ________. a. homogeneous mixture called a solution b. homogeneous mixture called a suspension c. heterogeneous mixture called a solution d. heterogeneous mixture called a suspension
- A solution containing an ionic compound is subjected to the anion and cation confirmation tests performed in this experiment. Addition of silver nitrate: a bright yellow precipitate formed Flame tes
- A student tested her liquid unknown and determined the density to be 0.85 g/mL, the boiling pint to be 108 degrees C, and that the liquid is insoluble in water, soluble soluble, soluble in cyclohexane, and partially soluble in ethanol. What is the best co
- A white hazy substance formed when adding silver nitrate to tap water. A. The haze was caused by what chemical substance? Give both name and formula. B. Why did the silver nitrate makes the solution hazy?
- Missy Mae performs a flame test on the unknown compound, which reveals a lilac color. An aqueous solution of the unknown compound yields the following results: i. forms no precipitate when 0.10 M sod
- Hard water contains Ca^2+, Mg^2+, and Fe^2+, which interfere with the action of soap and leave an insoluble coating on the insides of containers and pipes when heated. Water softeners replace these ions with Na^+. If 1500 L of hard water contains 0.020 M
- Which of these changes are chemical changes? a silver teapot turns black. sugar crystals are ground to a fine powder. two clear colorless salt solutions are mixed and a bright orange precipitate fo
- The point at which the indicator in the reactant solution changes color is the {Blank} of the titration. \\ A. end point B. equivalence point C. reaction point D. standard point
- An acid solution is titrated to the pink phenolphthalein endpoint by a base solution. As time goes by, the pink color disappears and the solution becomes colorless again. This takes about 30 seconds or so and definitely is not due to the solutions mixing
- Dissolving one substance in another substance is a physical change. Consider a solution of salt or sugar in water: 1) There are no fixed proportions. 2) All of the substances keep their own properties. 3) The mixture can be separated into its parts thr
- Suppose an unknown solid is insoluble in water. Which of the following reagents would be useful in obtaining more information about the functional group in the unknown? a. 6 M HCl solution b. 3 M NaOH solution c. Dilute NH3 solution d. More than one answe
- Ghoton is given an unknown solution that only contains one of the two listed cations. Describe a simple test to distinguish between aqueous solutions of the following cations. State the distinguishing outcomes of the test and the indication of which catio
- Ten drops of an indicator was added to a 10.00 mL sample of powdered drink mix. The sample was titrated with a sodium hydroxide solution that was determined to be 0.1421 M. The initial burette reading was 1.16 mL. When the first permanent color change occ
- A water-soluble salt forms a precipitant during Group 3 analysis. An acidic solution of this precipitant and NaBiO_3 yields a pinkish color. This same salt has no reaction to concentrated H_2SO_4 or AgNO_3, what is the chemical formula for this salt?
- What should you observe in a heated water sample that contains temporary hardness? a. a color change b. solid formation or cloudiness c. a bad smell d. none of these
- Solid silver chromate is added to pure water at 25 C, and some of the solid remains undissolved. The mixture is stirred for several days to ensure that equilibrium is achieved between the undissolved A g 2 C r O 4 ( s ) and the solution. Analysis of
- A sample is a mixture of AgNO3, CuCl2, and FeCl3. When a 1.0000-g sample of the mixture is dissolved in water and reacted with excess silver nitrate, 1.7809 g of precipitate forms. When a separate 1.0000-g sample of the mixture is treated with a reducing
- Water can dissolve 1.8 times its weight in sugar at 0 C and the amount increases to nearly 5 times its weight at 100 C. In contrast, the solubility of salt (NaCl) in water is only about 36% (36 g salt/100 g water) even though it is a smaller molecule than
- You have an unknown containing five carbon atoms, has pH of 6, yields a yellow solution having no precipitate in a 2, 4-DNP test, and produces a Jell-O like blue-green solution in a chromic acid test. Name ONE functional group your unknown could contain.
- Which substance will dissolve in water to produce a basic solution? (a) FeCl3 (Ka of HCl = 1.3 times 10^6) (b) KCl (Ka of HCl = 1.3 times 10^6) (c) NaCH3COO (Ka of CH3COOH = 5.6 times 10^(-10))
- A compound A (C_22H_27NO) is insoluble in acid and base but reacts with concentrated aqueous HCl and heat to give a clear aqueous solution from which, on cooling, benzoic acid precipitates. When the supernatant solution is made basic, a liquid B separates
- Is mixing sugar dissolved in water with silver nitrate a chemical change?
- Distillation is a process that separates the substances in liquid solutions based on their: a. boiling points b. melting points c. solubility d. color
- The following solution is titrated and is at its equivalence point: HF+ KOH. Bromothymol blue is an indicator that causes solutions to change color. It is yellow in pHs below 6.5, green from 6.5 to 7.5, and blue above 7.5. If bromothymol blue is added, wh
- A sample of water was observed to have peculiar taste. The taste may be caused by chloride ions or sulphate ions. How can you determine which ion is responsible for the taste? Identify which solutions you would need for your experiment and the precipitate
- In an experiment to remove lead from a sample of water, a student added potassium iodide to a solution of lead nitrate and obtained a precipitate of Pbl2. At the end of the reaction, the student isola
- Solubility product calculations are actually based on heterogeneous equilibria. Why are pure solids and liquids exempted from these calculations?
- Identify these unknown organic compounds: 1. Acetyl chloride Test: There is no visible change 2. Lucas test: No change was observed 3. Ferric Hydroxamate: A light yellow solution resulted 4. Ferrous Hydroxide Text: A clear yellow solution resulted 5.
- During lab a student completely dissolved 0.5 g of a white solid in water, meaning that all of the solid dissolved, none was left on the bottom of the beaker. She tested the conductivity of the solution and determined that the solution did not conduct ele
- Camphor, C_{10}H_{16}O, are colorless crystals with a specific gravity of 0.990 at 25^\circ C, sublimes at 204^\circ C, insoluble in water and very soluble in alcohol and ether. Praseodymium chloride, PrCl_3, are blue-green needle crystals with a specif
- A solution of a substance X is used for whitewashing. a. Name the substance X and write its formula. b. Write the reaction of substance X with water.
- Identify these unknown organic compounds: 1) 2,4-DNP Test: A yellow precipitate is formed 2) Tollen's Test: A bright silvery mirror forms on the inside of the test tube 3) Chromic acid test: Within 1-2 seconds a blue-green color appears 4) Iodoform te
- A compound x has a solubility of 79 g/100 g H2O. When 24 g of x are added to 68 g of water, is the resulting mixture homogeneous or heterogeneous?
- When metal X is placed in a solution of Y2+, the surface of metal X changes color. When metal Y is placed in acid solution, colorless gas bubbles form on the surface of the metal. When metal X is placed in a solution of Z2+, no change is observed in the s
- Is cloudy pond water a solution or heterogeneous mixture? Identify the solute and the solvent.
- Consider the following reaction: FeSCN^{2+} (aq) (red) to Fe^{3+} (aq) (pale yellow ) + SCN^- (aq) (colourless) The solution was initially dark red in color. If some Ag^+ were added to the solution to form AgSCN(s), what would happen to the color of the s
- Shelly did an experiment at school in which she had to form 2.00 grams of precipitate by mixing 2 hydrated compounds. So for the products, obviously one of them is water, and the other 2 products are compounds, one of which, is insoluble. So when she meas
- A student made a miraculous discovery and said a hydrate of cobalt (II) chloride changes color as a result of the presence of water vapor, as shown in the reaction below. Is the student correct, does the compound change to pink color indicating moist air?
- Hard water contains Ca , Mg, Fe and Na which interfere with the action of soap and leave an insoluble coating on the insides of containers and pipes when heated. Water softeners replace these ions wit
- A 1.0 mL volume of 0.010 M H2SO3 is added to a mixture of 12 drops of 0.010 M HIO3, 8 drops of deionized water, and 1 drop of starch solution. A color change occurred after 40 seconds. The rate of rea
- Water-sensitive laboratory chemicals are often stored in the presence of a desiccant called Drierite (white CaSO4), which attracts atmospheric water to form white CaSO4 2H2O. Drierite also contains a small amount of CoCl2, which changes color upon hydra
- A clear liquid was found in a laboratory, and it was desired to know if it could be disposed of safely down the drain. It was found to be miscible with water and weakly acidic. Which of the following results is most useful as to determine whether it has s
- An unknown substance has a melting point of 872^{\circ}C , is soluble in water, does not conduct heat as a solid, and is hard. Given these properties which of the following are possible identities fo
- Were the solids that formed when the MgSO4 solution was added to the detergent solution the result of a physical or chemical change?
- A moderately reactive metallic element (whose melting point is 850 degrees C) burns in a container of a greenish gas (also an element) to produce a white solid. The white solid dissolves in water to form a clear solution. When carbon dioxide gas, CO2, is
- The color change from blue to white as copper(Il) sulfate pentahydrate is heated indicates: a. the occurrence of a chemical change. b. that a mistake was made during the heating. c. the occurrence of a physical change.
- 100 g of a clear liquid is evaporated and a few grams of white crystals remain. The original liquid was a _____? (1) Heterogeneous compound (2) Heterogeneous mixture (3) Homogeneous compound (
- The following reaction is used to help convert river water into tap water: 3 Ca(OH)2(aq) + Al2(SO4)3(aq) \rightarrow 2 Al(OH)3(s) + 3 CaSO4(s) The aluminum hydroxide is a gooey solid that settles slowly out of solution, carrying suspended particles and b
- When most Fe^3+ salts are dissolved in dilute nitric acid, the solution is often yellow to orange-yellow in color. Why could you not visually detect these colors in Fe(NO3)3 stock solution?
- The of a titration occurs when the indicator changes color, and the point at which an acid has completely reacted with or been neutralized by the base is known as the. a. endpoint; equivalence point b. equivalence point; endpoint c. endpoint; neutral poin
- When a precipitate forms in gravimetric analysis, one must be concerned with contamination. Often this can happen when unwanted materials in the solution become involved with the precipitate. Adsorption and absorption are two processes that can bring this
- A mixture contained aluminum sulfate and sodium sulfate. A sample of the mixture weighing 3.458 g was dissolved in water and treated with sodium hydroxide solution to yield a precipitate. The precipitate was incinerated to yield 0.474 g aluminum oxide. a.
- A sample of a bright blue mineral was weighed in air, then weighed again while suspended in water. An object is buoyed up by the mass of the fluid displaced by the object. In air, the mineral weighed 7.35 g; in water, it weighed 5.40 g. The densities of a
- A 0.879 g sample of a CaCl2 2H2O / K2C2O4 H2O solid salt mixture is dissolved in 150 mL of deionized water. A precipitate forms which is then filtered and dried. The mass of this precipitate is 0.284 g. The limiting reagent in the salt mixture was later d
- 1 mL of 0.1 mol/L CuSO4 is mixed with a few drops of concentrated NH3. Then about 1 mL of 1 mol/L HCl is added to the solution. When performed in the lab, the solution went from a light blue to a solution that had a blue precipitate at the bottom, a dark
- What color change is exhibited by phenolphthalein during a titration of aqueous acetic acid with aqueous sodium hydroxide? a. colorless to pink b. pink to colorless c. green to yellow d. yellow to blue
- Determine the colour of silver metal and copper nitrate in water. Compare this to the colour of copper and silver nitrate in water.
- Two solids (barium hydroxide octahydrate and ammonium thiocyanate) are mixed together in a flask, which is then set on a puddle of water on a wood block. A reaction occurs spontaneously, and the products form a liquid in the beaker and freeze the puddle o
- Fe^{3+} (yellow) + SCN (colorless) leftrightarrow [FeSCN]^{2+}(dark red) If Fe^{3+} is added to the solution: (a) The solution turns darker red (b) The solution becomes more yellow (c) No changes in color occur (d) The solution becomes colorless
- An unknown liquid sample is analyzed using paper chromatography using solvent X as the mobile phase. One spot is observed after the plate is developed and visualized. The same unknown substance is re-analyzed using solvent Y as the mobile phase. This time
- A 2.00 L sample of mineral water is evaporated down to approximately 50 mL. The potassium present in the concentrated solution is then precipitated by NaB(C_6H_5)_4. K^+ + NaB(C_6H_5)_4 to KB(C_6H_5)_4 + Na^+ The precipitate is filtered, washed and re-dis
- When CuSO4.5H2O is dissolved in water the solution becomes slightly cooler than the water was before the CuSO4.5H2O was added. The equation for this process is: CuSO4.5H2O (s) + H2O (l) \rightarrow CuSO4(aq) Select the answer which best describes this p
- A 2.000-g sample of a solid mixture containing only PbCl_2 (FM 278.1), CuCl_2 (FM 134.45), and KCl (FM 74.55) was dissolved in water to give 100.0 mL of solution. First 50.00 mL of the unknown was treated with sodium piperidine dithiocarbamate (FM 527.77)
- A blue solid is changed into a white substance and a colorless gas. Was the blue solid an element or a compound? Explain your reasoning.
- An unknown compound is tested with several reagents, yielding the following results; DNP test: A thick, yellow precipitate formed Tollens test: No precipitate or mirror was detected Iodoform test: A
Explore our homework questions and answers library
Browse
by subject