Briefly explain whether the following procedural errors would result in either a

Question

Briefly explain whether the following procedural errors would result in either an incorrectly high or incorrectly low calculated percent Cu recovery for this experiment.

A) This solution was not basic when it was heated in part 3. ( in part 3 i convertedCu(OH)2 to CuO).

B) A slightly blue solution was decanted from Cu in part V. (in part 5 i reduced Cu(H20)6 ions with zink)

C) In part 5 the water in the beaker boiled away, exposing the evaporating dish to excess heat (same as above).

D)Why couldn't you substitute 3M H2SO4 for concentrated HNO3

Explanation / Answer

due to use of H2SO4 oxidation takes place of cu which cause low precipitation of Cu(OH)2. Which cause the low calculated percentage of Cu

Cu(OH)2(s) + H2SO4(aq) = CuSO4(aq) + 2 H2O(l)

it also changed the CuO IN Cu(OH)2(s)

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