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Experiment No. N

Analysis of Sodium Hydroxide (Na⁺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
Flame testGolden yellow flamePresence of Na⁺ is indicated
Confirmatory Test
Zinc Uranyl Acetate Test
Salt solution + Zinc Uranyl Acetate reagent		Yellow crystalline precipitatePresence of Na⁺ is confirmed

Result

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