A 55 gallon drum of waste water contains chromium waste from an electroplating business. The...
Question:
A 55 gallon drum of waste water contains chromium waste from an electroplating business. The standard for chromium in drinking water is 100 ppb (0.1 mg/L) The chromium waste is in the form of dichromate ion (Cr2O7{eq}^{2-} {/eq}) in a solution of strong sulfuric acid. If the drum of waste water contains 1.5 ounces of K2Cr2O7 (potassium dichromate,) calculate the dilution required to lower the concentration of chromium ions (Cr{eq}^{6+} {/eq}) to the permissible level for drinking water. (don't panic if your number looks really big - like huge!)
Dilution:
An experimental setup often needs to change the solution concentration by creating modifications to the amount of solvent. This process is known as dilution which describes the method of decreasing the solute concentration in the mixture. This can be mathematically shown in the equation
$$\rm{C_1V_1=C_2V_2}$$
Answer and Explanation: 1
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First, we will determine the concentration of {eq}Cr^{6+}{/eq} in the drum of wastewater. Note that 1 ounce is equal to 28.3495 g and 1 gallon is...
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Calculating Dilution of Solutions
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Chapter 8 / Lesson 5
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