Suggest a test chemical that can be added to a water sample to percipitate the lead(II) ions. show a chemical equation for the formation of the percipitate you have chosen.

To precipitate lead(II) ions from a water sample, one suitable chemical is sodium sulfide (Na2S). The reaction between lead(II) ions (Pb2+) and sulfide ions (S2-) present in sodium sulfide results in the formation of lead(II) sulfide (PbS) as a precipitate.

The chemical equation for this reaction is:

Pb2+(aq) + S2-(aq) → PbS(s)

To conduct this test, you can follow these steps:

1. Prepare a small volume of the water sample you want to test in a test tube or beaker.

2. Add a few drops of sodium sulfide (Na2S) solution to the water sample.

3. Observe the appearance of a black precipitate forming. This black precipitate is lead(II) sulfide (PbS).

Please note that working with chemicals should be done with caution and appropriate safety measures.