Based on the structures of H3PO2(l), H3PO3(l), and H3PO4(l), determine the number of ionizable protons (acidic hydrogen atoms) per formula unit.

Insoluble sulfide compounds are generally black in color. which of the following combinations could yield a black precipitate? check all that apply. na2s(aq)+kcl(aq) li2s(aq)+pb(no3)2(aq) pb(clo3)2(aq)+nano3(aq) agno3(aq)+kcl(aq) k2s(aq)+sn(no3)4(aq)