Test for Anions (chemistry)

• To test for carbonate ions , you need to add dilute HCL to the test sample. Take the gas thats produced and run it through lime water

  if the lime water turns cloudy , carbonates are present
• we add dilute HCl to get rid

  of impurities
• To test sulfate ions , add barium chloride solution

  if sulfate ions are present , white precipitates will form
• Sulfates are a white precipitate
• test for halide ions is also known as the silver nitrate test
• Halide ions are chloride , bromide and iodide
• Anions are negative charged ions
• We add nitric acid to the test sample in a halide ions test
• We use nitric acid instead of HCL to get rid of impurities because HCL already has Cl which is a halide
• Step 2 of the halide ions test is to add silver nitrate solution
• If halide Ions are present

  Cl- -> white precipitate

  Br- ->cream precipitate

  I- -> yellow precipitate
• Lime water is also calcium hydroxide