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Experiment No. N

Analysis of Zinc Acetate (Zn²⁺CH₃COO⁻)

Aim

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

Preliminary Test

  • Odor: Vinegar-like
  • Texture: Crystalline
  • Color: White
  • Solubility: Soluble in water

Test of Anion

ExperimentObservationInference
Salt + Dilute H₂SO₄No reactionDilute H₂SO₄ group is absent
Salt + Conc. H₂SO₄Vapours with vinegar-like smell evolveCH₃COO⁻ may be present
Confirmatory Tests
Oxalic Acid Test
Take pinch of salt on palm and pinch of oxalic acid and 2-3 drops of water and make a paste		Strong vinegar-like smell is obtainedPresence of CH₃COO⁻ is confirmed
Ferric Chloride Test
Salt Solution + FeCl₃ solution		Reddish-brown ppt is obtainedPresence of CH₃COO⁻ is confirmed

Test of Cation

ExperimentObservationInference
Salt + NaOH solutionNo reactionZero group cation is absent
Original Salt + Dil. HClNo reactionFirst group cation is absent
Original Salt + Dil. HCl + NH₄Cl solid + NH₄OH solutionNo reactionThird group cation is absent
Original Salt + Dil. HCl + NH₄Cl solid + NH₄OH solution + H₂SO₄Dirty white pptPresence of Zn²⁺ may be present
Confirmatory Tests
Sodium Hydroxide Test
Salt solution + NaOH solution drop wise		White ppt dissolved in HClPresence of Zn²⁺ is confirmed
Potassium Ferrocyanide Test
Salt solution + K₄[Fe(CN)₆] solution		Bluish-white pptPresence of Zn²⁺ is confirmed

Result

The given salt contains Zn²⁺ ions as cation and CH₃COO⁻ ions as anion. The salt is Zn²⁺CH₃COO⁻.

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.