Which of the following compounds is soluble in water Ga2O3, Na3P, ZnS, Hg2Cl what are the spectator ion(s) in the following reaction.

Which of the following compounds is soluble in water
Ga2O3, Na3P, ZnS, Hg2Clwhat are the spectator ion(s) in the following reaction.
Cu(OH)2(s) + 2H+(aq) + 2Cl–(aq)  Cu2+(aq) + 2Cl–(aq) + 2H2O(l)