Interpretation:
The procedural mistake that would result in determining a percentage of water that is too low has to be given.
Answer to Problem 1PQ
The procedural mistake that would result in determining a percentage of water that is too low is heating the sample in closed container. Hence, option (A) is correct.
Explanation of Solution
Reasons for correct option:
The percentage of water would be low if the hydrated salt sample is heated in closed container. On heating the sample in closed container, the molecules of water will not be removed properly. The sample will show presence of water molecules if it is heated in a closed container whereas heating the salt in open container will remove the water molecules completely. Hence, option (A) is correct.
Reasons for incorrect option:
Option (B) is incorrect because reweighting the sample before it cooling to room temperature will not lower the percentage of water. Hence, it is incorrect.
Options (C) and (D) is incorrect because only heating the sample in closed container will lower the mass percentage of water.
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