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

Idont really know sorry