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Experiment No. N

Analysis of Aluminum Carbonate (Al³⁺CO₃²⁻)

Aim

To determine the presence of anion and cation in the given salt

Preliminary Test

  • Odor: Odorless
  • Texture: Crystalline
  • Color: White
  • Solubility: Soluble in water

Test of Anion

ExperimentObservationInference
Salt + Dilute HClColorless, odorless gas evolves with brisk effervescenceCO₃²⁻ may be present
Confirmatory Tests
Lime Water Test
Pass the evolved gas through lime water		Lime water turns milkyPresence of CO₃²⁻ is confirmed
Magnesium Sulphate Test
Salt solution + MgSO₄ solution		White ppt is obtainedPresence of CO₃²⁻ is confirmed

Test of Cation

ExperimentObservationInference
Salt solution + NaOHNo reactionZero group cation is absent
Salt solution + Dil HClNo reactionFirst group cation is absent
Salt solution + Dil HCl + H₂S gas (N₂S chips)No reactionSecond group cation is absent
Salt solution + Dil HCl + NH₄Cl solid + NH₄OH solutionWhite gelatinous pptAl³⁺ may be present
Confirmatory Test
Blue Lake Test
Dissolve the white ppt in HCl + 2-3 drops of blue litmus + 2-3 drops of NH₄OH solution		Blue ppt floating in colorless solutionPresence of Al³⁺ is confirmed

Result

The given salt contains Al³⁺ ions as cation and CO₃²⁻ ions as anion. The salt is Al³⁺CO₃²⁻.

Precautions

  1. Handle the chemicals with care.
  2. Don't use excess of chemicals.
  3. Keep the mouth of the test tube away from the face.