The percentage of water in an unknown hydrated salt is to bedetermined by weighi

Question

The percentage of water in an unknown hydrated salt is to bedetermined by weighing a sample of the salt, heating it to driveoff water, cooling it to room temperature, and re-weighing. Whichprocedural mistake would result in determining a percentage ofwater that is too low? Procedural Mistakes I.    heating the sample in aclosed, rather than an open, container II.  re-weighing thesample before it has cooled to room temperature A. I only B. II only C. both I andII D. neither I norII Please EXPLAINyour answer. The percentage of water in an unknown hydrated salt is to bedetermined by weighing a sample of the salt, heating it to driveoff water, cooling it to room temperature, and re-weighing. Whichprocedural mistake would result in determining a percentage ofwater that is too low? Procedural Mistakes I.    heating the sample in aclosed, rather than an open, container II.  re-weighing thesample before it has cooled to room temperature A. I only B. II only C. both I andII D. neither I norII Please EXPLAINyour answer.

Explanation / Answer

the two options mentioned would cause and error of acalculation of two low a percentage of water. The reason being that the final weight of the salt wouldbe more than was really there. the heat would cause it to appear to heavy and teh closedcontainer would retain some of the water from the same thatwould condence in the salt again.

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