Question

1. Indicate which of the following compounds are NOT WATER-SOLUBLE:

Ba(C2H3O2)2      FeCl3    FePO4   CuCl2

2. Indicate which of the following compounds are STRONG electrolytes:

NaCl      AgNO3      HCN      HNO3      HC2H3O2

3. Indicate which of the following compounds are WEAK electrolytes:

HNO3     HF     HCl     NH4Cl     NaOH

4. indicate the ions formed in an aqueous solution:       

NaI      K2SO4      NaCN      BaCl2     (NH4)2SO4

Answer 1

1. FePO4 ,   (except few most of the phosphates are insoluble)

2. NaCl , AgNO3 , HNO3 (all strongacid,bases and salts are strong electrolytes)

3. HF   (all weakacid,bases are weak electrolytes)

4.   NaI(aq) -----> Na^+(aq) + I^-(aq)

   K2SO4(aq) -----> 2 K^+(aq) + SO4^2-(aq)

   NaCN(aq) -----> Na^+(aq) + CN^-(aq)

    BaCl2(aq) ------> Ba^2+(aq) + 2 Cl^-(aq)

(NH4)2SO4(aq) -----> 2 NH4^+(aq) + SO4^2-(aq)