During the cooling of a fired crucible, water vapor condensed on the crucible wa

Question

During the cooling of a fired crucible, water vapor condensed on the crucible wall before the crucible's mass was measured. The condensation did not reoccur following thermal decomposition of the hydrated salt in Part B. Will the reported percent water in the hydrated salt be reported too high, too low, or just right?

a. too high- the calculated mass of the crucible is so high the calculated mass lost is also high, producing a high % water.

b. just right- the condensed water will not affect the calculated % water

Explanation / Answer

Too high - mass of hydrated salt would be lower than expected and the mass measurement of

the crucible and lid would be too high

Hydrated salt - higher, Anhydrous salt - lower, Water lost - higher

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