Notebook Theme

Analysis of Manganese(II) Carbonate (MnCO₃)

Qualitative analysis

Aim

To analyse the given inorganic salt for one acidic and one basic radical.

Preliminary Test

  • Colour: Pale pink
  • Odour: Odourless
  • State: Crystalline solid
  • Solubility: Insoluble in water

Test of Anion (CO₃²⁻)

ExperimentObservationInference
Take 0.1 g of salt, add 1–2 mL of dilute H₂SO₄Colourless odourless gas is evolved with brisk effervescence; lime water turns milkyCO₃²⁻ may be present
Confirmatory Test
Lime Water Test
Pass the gas through lime water
Lime water turns milky; milkiness disappears on passing excess gas (soluble calcium bicarbonate)CO₃²⁻ is confirmed

Test of Cation (Mn²⁺)

ExperimentObservationInference
Original solution + H₂S gas in presence of NH₄OHBlack or flesh-coloured precipitate is formedGroup IV cation may be present
Confirmatory Test
Sodium Hydroxide Test
Dissolve the precipitate in dilute HCl by boiling and add NaOH in excess
White precipitate forms first, then turns brown on standingPresence of Mn²⁺ is confirmed

Result

The given salt contains Mn²⁺ as the cation (basic radical) and CO₃²⁻ as the anion (acidic radical). The salt is Manganese(II) Carbonate (MnCO₃).

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.