Textbook Problem

65. Many metal ions are precipitated from solution by the sulfide ion. As an example, consider treating a solution of copper(II) sulfate with sodium sulfide solution:

${\text{CuSO}}_4\left(\text{aq}\right)+{\text{Na}}_{\text{2}}\text{S}\left(\text{aq}\right)\to \text{CuS}\left(\text{s}\right)+{\text{Na}}_{\text{2}}{\text{SO}}_{\text{4}}\left(\text{aq}\right)$

What Volume of 0.105 M Na₂S solution would be required to precipitate all of the copper( II) ion from 27.5 mL of 0.121 M CuSO₄solution?