Negative ions ( anions ) halides

• Cl-

  add a bit of nitric acid first then add silver nitrate-precipitate=white
• Br-

  add a bit of nitric acid first then add silver nitrate-precipitate=cream
• I-

  Add a bit of nitric acid first then add silver nitrate - precipitate= yellow
• CO3^2-

  add acid CO2 bubbles
• SO4^2-

  Add barium chloride and hydrochloric acid = white precipitate