chemistry, It says I have one of them wrong. Need some help please!

Question

Classify each of the following possible reactions according to whether a precipitate will form or not. 

1)KI+Pb(NO3)2-->?

2)CrCl2+Li2CO3-->?

3)Na3PO4+CoCl2-->?

4)KI+NaCl-->?

5)KNO3+NaCl-->?

Precipitate                              Nonprecipitate

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Answer 1

the reaction shown in 1. would yield PbI₂, which is only very slightly soluble in water, thus a precipitate will form

the reaction shown in 2. would yield CrCO₃, which is insoluble in water, thus a precipitate will form

the reaction shown in 3. would yield Co₃(PO₄)₂, which is insoluble in water, thus a precipitate will form

 

the reactions shown in 4 and 5 would yield highly soluble salts, so no precipitate will form