Anion Test - Iodide Ions Solutions containing iodide ions are typically colourless in colour.To test for the presence of iodide ions in solution, you may use the lead(II) nitrate test.Lead(II) Nitrate Test - To a sample of your solution, add an equal volume of dilute nitric acid. No visible observations can be made. Upon addition of a few drops of lead(II) nitrate, a yellow precipitate forms.











