In performing a gravimetric analysis experiment of a salt mixture the student was instructed to...
Question:
In performing a gravimetric analysis experiment of a salt mixture the student was instructed to weigh a crucible, add the sample, reweigh it, then heat the mixture to constant weight. When she begins the experiment, she notices that the sides of the crucible is wet with beads of the unknown liquid from its use in the previous lab period. She proceeds to carry out the experiment anyway. Provided that she does everything else correctly, the yield of the product would be:
a) too high
b) correct
c) too low
d) could either be too high or too low
Gravimetric Analysis:
Gravimetric analysis is a quantitative method in which the amount of analyte is determined using the weight of the solid. The different methods of gravimetric analysis are precipitation gravimetry, volatilization gravimetry, electrogravimetry and thermogravimetry.
Answer and Explanation: 1
The yield of the product that is obtained could either be too high or too low. Since the sides of the crucible are wet with an unknown liquid, this liquid can react with the substance present in the crucible contributing to an increase in weight of the crucible and thereby, increasing the yield of the product. If the liquid that is added vaporizes the substance present in the crucible, it can reduce the weight of the crucible and thereby reducing the yield of the product. So, the options a, b and c are incorrect.
The correct option is d.
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The Difference Between Qualitative & Quantitative Measurement
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Chapter 9 / Lesson 2
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Learn the difference between qualitative and quantitative measurement. Understand more about qualitative and quantitative measurement through examples.
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