Go to Top Go to Teachers Index Safety Solutions should not come in contact with the skin, in particular the lead nitrate solution. Solutions containing heavy metals should be discarded into a properly labeled waste container. However, more drops of solutions might be needed per test. Emphasize the usefulness of both positive and negative results in determining solubility rules. See chart at the end of this Teacher's Guide section.
Colors given are for precipitates, except where solution is noted.
I Data Analysis and Concept Development 1. Answers will vary. Emphasize that a color change alone does not necessarily indicate the formation of a precipitate. Some students will have difficulty observing the lead chloride precipitate if concentrations are not high enough. Nitrate and sodium 4.