Which of the following are soluble in water select all that

Which of the following are soluble in water? (select all that apply) Fe(OH)3 (NH4)2SO4 AlPO4 ZnCO3 K3PO4 Pb(NO3)2 CaCl2 AgCl PbSO4

Solution

the rules are

all hydroxides are insoluble except those of Na+ , K+ , Ba+2 , Ca+2

all nitrates are soluble

all chlorides are soluble except those of Ag+ , Pb+ and Hg2+2

all sulfates are soluble except those of Pb+2 , Ba+2 , Sr+2 , Ca+2

all phosphates and carbonates are insoluble except those of Na+ , NH4+ and K+

so

the ones that are soluble are

1) Pb(NO3)2

2) K3PO4

3) (NH4)2SO4

4) CaCl2