1) in procedure B, if the empty crucible is not heated longenough to completely

Question

1) in procedure B, if the empty crucible is not heated longenough to completely dry it prior to weighing, what will be theeffect on the calculated percent water in the unknown( larger orsmaller)? explain. 2) in procedure B, if the heated crucible containing theunknown is allowed to cool on the lab bench instead of in thedesicooler, what will be the effect on the caculated percent waterin the unknown(larger or smaller)? explain. 1) in procedure B, if the empty crucible is not heated longenough to completely dry it prior to weighing, what will be theeffect on the calculated percent water in the unknown( larger orsmaller)? explain. 2) in procedure B, if the heated crucible containing theunknown is allowed to cool on the lab bench instead of in thedesicooler, what will be the effect on the caculated percent waterin the unknown(larger or smaller)? explain.

Explanation / Answer

1) By the law of conservation of mass, no matter can becreated or destroyed. Therefore, if not all the water isevaporated, then the unknown mass will be greater. Thus, thecalculated percentage of water will be less than what it actuallyis. 2)It will cause the caclculated percentage of water beslightly less than what is actually is. This is due to the factthat if the unknown is completely dry, it will absorb of the waterin the air.

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