RIGHT)}_{2}}}}\,~\xrightarrow[aq.]{NaOH}\underset{White\,ppt.}{\mathop{Zn{{\left( OH \right)}_{2}}}}\,\] \[\xrightarrow[NaOH]{EXCESS}N{{a}_{2}}\underset{So\operatorname{lub}le}{\mathop{[Zn{{(OH)}_{4}}]}}\,\xrightarrow{{{H}_{2}}S}\underset{White\,ppt.}{\mathop{ZnS}}\,\]