Question

Determine whether each of the following compounds is soluble or insoluble ? HgI2, CaCO3, AlPO4, K3PO4

Answer 1

the rules to follow are

1) all the salts of group I elements like Na , K , and also NH4+ are soluble

using this rule

we get

K3P04 is soluble

2) Carbonates , phosphates of all elememts except for group I elements Na , K , NH4+ , Li+ are insoluble

so

CaC03 is insoluble

AlP04 is insoluble

3)

Chlorides (Cl–), bromides (Br–), and iodides (I–) are soluble except for those of Ag+, Pb2+, and Hg22+

HgI2 is insoluble

So

finally

K3P04 --> Soluble

HgI2 , CaC03 , AlP04 ---> insoluble