Question

Which of these reactions will produce a precipitate, assuming 0.1 M solutions are combined?

a) NH₄OH + HCl
b) Pb(NO₃)₂ + KI
c) Na₂SO₄ + LiNO₃

Answer 1

The reaction that will produce a precipitate is Pb(NO3)2 + KI. They produce lead(II) iodide, which is insoluble and forms a yellow precipitate.

Step-by-step explanation:

In this case, the reaction that will produce a precipitate is Pb(NO3)2 + KI. When these two solutions are combined, they produce lead(II) iodide, which is insoluble and forms a yellow precipitate. The balanced net ionic equation for this reaction is:

Pb2+(aq) + 2I-(aq) → PbI2(s)

Therefore, the correct answer is b) Pb(NO3)2 + KI.