A technician is making saturated aqueous solutions of copper chromate (mathrm{Cu}left(mathrm{CrO}_{4} ight)), copper hydroxide (mathrm{Cu}(mathrm{OH})_{2}), and mixtures

A technician is making saturated aqueous solutions of copper chromate \(\mathrm{Cu}\left(\mathrm{CrO}_{4}\right)\), copper hydroxide \(\mathrm{Cu}(\mathrm{OH})_{2}\), and mixtures of these two compounds. Assume solutions are ideal.

Data: Molecular weights: \(\mathrm{Cu}=63.546, \mathrm{Cr}=51.996, \mathrm{O}=16.00, \mathrm{H}=1.008\)

Solubility products: \(\mathrm{Cu}\left(\mathrm{CrO}_{4}\right), \mathrm{K}_{\mathrm{S}}=3.6 \times 10^{-6}(\mathrm{~mol} / \mathrm{L})^{2} . \mathrm{Cu}(\mathrm{OH})_{2}, \mathrm{~K}_{\mathrm{S}}=2.2 \times 10^{-20}\) \((\mathrm{mol} / \mathrm{L})^{3}\).

a. If the technician adds pure copper chromate to pure water to make 1.00 liters of saturated solution, how many grams should she add?

b. If the technician adds pure copper hydroxide to pure water to make 1.00 liters of saturated solution, how many grams should she add?

c. If there are \(2.0 \times 10^{-5} \mathrm{~g}\) of \(\mathrm{Cu}(\mathrm{OH})_{2}\) dissolved in \(2.0 \mathrm{~L}\) of aqueous solution, and the technician wants to precipitate \(90 \%\) of the hydroxide [it precipitates as \(\mathrm{Cu}(\mathrm{OH})_{2}\) ], how much \(\mathrm{Cu}\left(\mathrm{CrO}_{4}\right)\) should she add?

d. Does any \(\mathrm{Cu}\left(\mathrm{CrO}_{4}\right)\) precipitate in part c? Explain your reasoning.