how many of the following compounds are soluble in water CuO

how many of the following compounds are soluble in water?

Cu(OH)2 LiNO3 NH4Br K2S

a. 4

b. 0

c. 2

d. 3

e. 1

Solution

1.negligible

2.)Rules of thumb for solubility say that alkali metal salts are almost always soluble and nitrates are almost always soluble. Lithium nitrate is both.

3.)yes

4.)YEs converts to KSH, KOH