Construct the flow diagram for the separation scheme for a solution containing
\(\mathrm{Ag}^{+}, \mathrm{Ni}^{2+},\) and \(\mathrm{Zn}^{2+}\). The steps in the
procedure are as follows:
Step 1. Add \(6 \mathrm{M}\) HCl to precipitate \(\mathrm{Ag}^{+}\) as
\(\mathrm{AgCl}\). \(\mathrm{Ni}^{2+}\) and \(\mathrm{Zn}^{2+}\) are not affected.
Centrifuge out the AgCI.
Step 2. Add 6 M NaOH in excess, precipitating Ni(OH), (s) and converting Zn't
to the Zn(OH), \(_{4}^{2-}\) complex ion. Centrifuge out the
\(\mathrm{Ni}(\mathrm{OH})_{2}\)
Step 3. Neutralize the solution with \(6 \mathrm{M}\) HCl to \(\mathrm{pH}=7 .\)
Add \(1 \mathrm{M} \mathrm{Na}_{2} \mathrm{CO}_{3}\), precipitating
\(\mathrm{ZnCO}_{3}\)
diagram
