Question

Q. What test could you perform to detect the presence of I‾ ion?

PLEASE, use clear hand-writing*

Answer 1

Halide ions in solutions are detected using silver nitrate solutions. The test solution is acidified using a few drops of dilute nitric acid, and then a few drops of silver nitrate solution are added. Different coloured silver halide precipitates form, depending on the halide ions present:

• chloride ions give a white precipitate of silver chloride
• bromide ions give a cream precipitate of silver bromide
• iodide ions give a yellow precipitate of silver iodide