A student dried a wet crucible with a kimwipe. A piece of kimwipe was left clinging to the inside...

Question:

A student dried a wet crucible with a kimwipe. A piece of kimwipe was left clinging to the inside wall of the crucible. The student did not see the piece of kimwipe when adding the {eq}\rm NaHCO_3-KCl {/eq} mixture to the crucible. The crucible and its contents were weighed and subjected to three heating cooling cycles. Could this experimental error significantly affect the percentage of {eq}\rm NaHCO_3 {/eq} in the mixture? Justify your answer with an explanation.

Heating Cooling Cycles:

The repeated heating and cooling of a compound that takes place to alter a compound's chemical property is represented by the heating-cooling cycles. It is performed to introduce some desirable properties in the compound.

Answer and Explanation:

After the empty crucible is weighed that is not actually empty if the sodium bicarbonate and KCl mixture are added after weighing in the crucible and heated directly then the chances of errors in the heating and cooling cycles are minimum.

If the mass of sodium bicarbonate and KCl mixture in the crucible is taken before heating then there will be errors in the cycles. This is because the mass of content is not the same as measured. The weighed mass of content includes the mass of Kim wipes also. So, there will be errors in the heating-cooling cycles.


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What are Heating and Cooling Curves?

from College Chemistry: Help and Review

Chapter 6 / Lesson 5
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