13. A chemistry student offers a possible improvement to this lab. Since one goal of this lab isto determine the mass of the precipitate produced, wouldn't it be possible to measure themass of an empty beaker, mix the solutions, and boil off the water until it is entirelyevaporated, leaving only solid behind? Then the beaker with the precipitate could beweighed, and the difference between this mass and that of the empty beaker would be themass of the precipitate. This would eliminate the need for the filtration step. Explain whythis is a poor suggestion. Remember to check your reasoning on this question and all otherquestions with your instructor.

Answered: evaporated, leaving only solid behind?…

Chemistry: Principles and Practice

3rd Edition

ISBN:9780534420123

Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Chapter12: Solutions

Section: Chapter Questions

Problem 12.5QE

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13. A chemistry student offers a possible improvement to this lab. Since one goal of this lab is
to determine the mass of the precipitate produced, wouldn't it be possible to measure the
mass of an empty beaker, mix the solutions, and boil off the water until it is entirely
evaporated, leaving only solid behind? Then the beaker with the precipitate could be
weighed, and the difference between this mass and that of the empty beaker would be the
mass of the precipitate. This would eliminate the need for the filtration step. Explain why
this is a poor suggestion. Remember to check your reasoning on this question and all other
questions with your instructor.

Expert Solution

Importance of filtration

In gravimetric analysis , once when the precipitate is formed , we should filter the precipitate and wash it . This filtration and washing step removes the insoluble impurities that are directly attached with the precipitate . This makes the precipitate pure and hence an accurate mass of it can be determined.

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