Using solubility guidelines, predict whether each of the following compounds is soluble or insoluble in water.

1. MgBr2

2. PbI2

3. (NH4) 2CO3

4. ZnSO4

5. Sr (OH) 2

1. MgBr2

Soluble.

Rule: all the binary compounds of the group 17 (different to F) with metals are solubles, except those formed with Ag, Hg (I) and Pb.

2. PbI2

Insoluble.

Rule: it is one of the exceptions stated in the rule above.

3. (NH4) 2CO3

Soluble.

Rule: salts containing NH4 (+) are soluble.

4. ZnSO4

Soluble

Rule: This salt is not an exception to the rule that most sulfate salts are soluble. Important exceptions to this rule include BaSO4, PbSO4, Ag2SO4 and SrSO4

5. Sr (OH) 2

Soluble (slightly soluble).

Rule: Hydroxide salts of Group II elements (Ca, Sr, and Ba) are slightly soluble