To test for Carbonate Ions:
Add: Dilute Hydrochloric Acid
If carbonate ions are present: If it fizzes and there is gas produced, bubble it through water and it turns the limewater milky.
To test for Halide (Chloride, Bromide or Iodide) Ions:
Add: Dilute Nitric Acid & Silver Nitrate Solution
( Precipitation reactions…