Preparation Of Salts

Question 1

Are all nitrate salts (NO₃⁻) soluble in water?

Answer 1

A: Yes, all nitrate salts are soluble.

Question 2

Which sulphate salts (SO₄²⁻) are NOT soluble in water?

Answer 2

Lead(II) sulphate (PbSO₄)
Calcium sulphate (CaSO₄)
Barium sulphate (BaSO₄)

Question 3

Which carbonate salts (CO₃²⁻) are soluble in water?

Answer 3

Potassium carbonate (K₂CO₃)
Sodium carbonate (Na₂CO₃)
Ammonium carbonate ((NH₄)₂CO₃)

Question 4

Are all ammonium(NH4+) , sodium(Na), and potassium(K) salts soluble in water?

Answer 4

Yes, all ammonium, sodium, and potassium salts are soluble.

Question 5

How are soluble potassium and sodium salts prepared?

Answer 5

1. Neutralisation through titration.
2. Evaporation to concentrate the solution.
3. Recrystallisation to form pure crystals.

Question 6

How are soluble non-potassium and non-sodium salts prepared?

Answer 6

1. React an acid with a metal oxide or metal hydroxide.
2. Evaporation to remove excess water.
3. Recrystallisation to obtain pure crystals.

Question 7

How are insoluble salts prepared?

Answer 7

1. Double decomposition reaction (mixing two soluble salts to form an insoluble salt).
2. Filtration to separate the insoluble salt.
3. Recrystallisation to purify the salt.

Question 8

______ is used to remove excess water from the solution to concentrate the salt before recrystallisation.

Answer 8

evaporation in salt preparation

Question 9

____to purify the salt by dissolving it in water and allowing it to crystallise slowly.

Answer 9

recrystallisation

Question 10

What apparatus is commonly used for filtration during the preparation of insoluble salts?

Answer 10

A: Filter paper and a funnel to separate the insoluble salt from the solution.

Question 11

Why is titration used to prepare soluble potassium and sodium salts?

Answer 11

It ensures accurate measurement of acid and alkali to achieve complete neutralisation without excess reactants.