List the formulas of three soluble bromide salts and three insoluble bromide salts. Do the same exercise for sulfate salts, hydroxide salts, and phosphate salts (list three soluble salts and three insoluble salts). List the formulas for six insoluble \(\mathrm{Pb}^{2+}\) salts and one soluble \(\mathrm{Pb}^{2+}\) salt.

Three soluble bromide salts are \(NaBr\), \(KBr\), and \(CaBr_2\); three insoluble bromide salts are \(AgBr\), \(PbBr_2\), and \(HgBr_2\). Three soluble sulfate salts are \(Na_2SO_4\), \(K_2SO_4\), and \((NH_4)_2SO_4\); three insoluble sulfate salts are \(BaSO_4\), \(CaSO_4\), and \(PbSO_4\). Three soluble hydroxide salts are \(NaOH\), \(KOH\), and \(Ba(OH)_2\); three insoluble hydroxide salts are \(Al(OH)_3\), \(Fe(OH)_3\), and \(Ni(OH)_2\). Three soluble phosphate salts are \(Na_3PO_4\), \(K_3PO_4\), and \((NH_4)_3PO_4\); three insoluble phosphate salts are \(Ca_3(PO_4)_2\), \(AlPO_4\), and \(FePO_4\). Six insoluble \(\mathrm{Pb}^{2+}\) salts are \(PbSO_4\), \(Pb_3(PO_4)_2\), \(Pb(OH)_2\), \(PbBr_2\), \(PbI_2\), and \(PbCO_3\); one soluble \(\mathrm{Pb}^{2+}\) salt is \(Pb(NO_3)_2\).