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Experiment No. N

Analysis of Calcium Hydroxide (Ca²⁺OH⁻)

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 Solution + Universal IndicatorSolution turns blue or purpleOH⁻ may be present
Confirmatory Test
Phenolphthalein Test
Salt Solution + Phenolphthalein indicator		Solution turns pinkPresence of OH⁻ anion 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 + H₂S gas (Na₂S chips)No reactionSecond group cation is absent
Original salt + Dil. HCl + NH₄Cl solid + NH₄OH solutionNo reactionThird group cation is absent
Original solution + Dil. HCl + NH₄Cl + NH₄OH + (NH₄)₂CO₃White ppt is formedBa²⁺ may be present
Confirmatory Tests
Dissolve the white ppt in dil. acetic acid and add potassium chromateNo reactionBa²⁺ absent
Dissolve the white ppt in dil. acetic acid and add (NH₄)₂SO₄No reactionSr²⁺ absent
Dissolve the white ppt in dil. acetic acid and add ammonium oxalate + a few drops of NH₄OHWhite pptCa²⁺ confirmed

Result

The given salt contains Ca²⁺ ions as cation and OH⁻ ions as anion. The salt is Ca²⁺OH⁻.

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.