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

1.) KI+NaCl
2.) Na3PO4+CoCl2
3.) Na2CO3+CuCl2
4.) LiNO3+Na2SO4
5.) CrCl2+Li2CO3

The reactions Na3PO4+CoCl2,  Na2CO3+CuCl2 and CrCl2+Li2CO3 produce precipitates.

A precipitate is said to be formed when reaction of two aqueous solutions produces an insoluble product. The insoluble solid product separates from the solution and is called a precipitate.

The full reactions are written below;

Hence, the reactions;

Produce precipitates.

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Reactions, 2, 3 and 5 make precipitates

Explanation:

1. The halogens always make aqueous salts with elements from group 1

2. Phosphate anion can make insoluble salts, the same as carbonate.

3. Nitrate anion always make aqueous salts

4. Sulfate anion makes aqueous salts except with Ag⁺, Pb⁺² and group 2

1. KI(aq) + NaCl(aq) → KCl(aq) + NaI(aq)

2. 2Na₃PO₄ (aq) + 3CoCl₂(aq) → 6NaCl(aq) + Co₃(PO₄)₂(s) ↓

3. Na₂CO₃ (aq) + CuCl₂ (aq) → 2NaCl (aq) + CuCO₃ (s) ↓

4. 2LiNO₃ (aq) + Na₂SO₄ (aq) → Li₂SO₄ (aq) + 2NaNO₃(aq)

5.  CrCl₂ (aq) + Li₂CO₃ (aq) → 2LiCl (aq) + Cr₂(CO₃)₂ (s) ↓