In an experiment to determine the formula weight of an unknown copper compound t

Question

In an experiment to determine the formula weight of an unknown copper compound through gravimetric analysis, what would have been the effect on the formula weight you calculated for your unknown:

If some of your unknown had not dissolved prior to the addition of Mg to the solution?

If the solution was still bubbling when you filtered your product?

If the solution was still blue to green when you filtered your product?

If your recovered copper was not completely dry when you determined its final mass?

Explanation / Answer

If some of your unknown had not dissolved prior to the addition of Mg to the solution then some of the Cu2+ ion is still undissolvesd in the solution which will decrease the formula weight of the unknown.

If the solution was still bubbling when you filtered your product then the the reaction was still taking place and splattering of solution may take place which decrease the amount of CU2+ in solution due to spilling of the contents hence it decreases the formula mass of unknown.

If the solution was still blue green then Cu2+ is still remaining in solution and then the precipitate formed by Cu is less is mass so the formula mass of unknown is less.

If your recovered copper was not completely dry then there was presence of some moisture which increased the mass of the copper product so the formula mass of copper extracted is less than the measured final mass

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