1. Would the reported mass percent of excess reactant be greater than, less than

Q: 1. Would the reported mass percent of excess reactant be greater than, less than

Q1 if preciptiate not dry --> it has water molecuels as Extra therefore, mass of precipitate increases, which implies a false increase in % mass Q2 if it is very fine, assume all solids remain in the filter, therefore, no effect at all, since solid will be separated from liquid

ID: 560639 • Letter: 1

Question

1. Would the reported mass percent of excess reactant be greater than, less than, or equal to the true mass percent of excess reactant if the precipitate was not completely dry when its mass was determined? Explain your answer. 2. Suppose your absent-minded lab partner grabbed medium porosity filter paper instead of fine porosity paper and you noticed cloudiness in your filtrate. Will the reported mass percent of limiting reactant be greater than, less than, or equal to the true mass percent of limiting reactant in the sample? Explain your answer.

Explanation / Answer

if preciptiate not dry --> it has water molecuels as Extra

therefore, mass of precipitate increases, which implies a false increase in % mass

if it is very fine, assume all solids remain in the filter, therefore, no effect at all, since solid will be separated from liquid

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1. Would the reported mass percent of excess reactant be greater than, less than

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