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Experiment No. N

Analysis of Magnesium Iodide (Mg²⁺I⁻)

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 + Conc H₂SO₄Violet vapors evolveI⁻ may be present
Confirmatory Test
Silver Nitrate Test
Salt Solution + Dilute HNO₃ + AgNO₃ solution		Yellow ppt insoluble in NH₄OHPresence of I⁻ anion is confirmed

Test of Cation

ExperimentObservationInference
Salt solution + NaOH solutionWhite precipitateMg²⁺ may be present
Confirmatory Test
Magneson Test
Salt solution + Magneson reagent + NaOH solution		Blue lake formationPresence of Mg²⁺ is confirmed

Result

The given salt contains Mg²⁺ ions as cation and I⁻ ions as anion. The salt is Mg²⁺I⁻.

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.