Question

A chemical compound X' is used in the soap and glass industry. It is
prepared from brine.
(a) Write the chemical name, common name and chemical formula of X.
(b) Write the equation involved in its preparation.
(c) What happens when it is treated with water containing Ca or Mg
salts ?​

Answer 1

Answer:sodium carbonate

Washing soda

Na2co3.10h20

b)ncert reader

C)magnesium streate or calcium streate

Explanation:

Answer 2

A. The compound is sodium carbonate decahydrate, baking soda or Na2CO3. 10H2O.

B. NaCl + NH3 + CO2 + H2O → NaHCO3 + NH4Cl

2 NaHCO3 → Na2CO3 + H2O + CO2

Na2CO3 + 10H2O → Na2CO3.10H2O

C. It forms the calcium carbonate and magnesium carbonate.

Explanation:

• The Industrial preparation of the washing soda is done through Solvay's process.

• Here ammonia and carbon dioxide is passed through the brine solution which produces the sodium bicarbonate and ammonium chloride.

• NaCl + NH3 + CO2 + H2O → NaHCO3 + NH4Cl

• Now the solution is heated to decompose the bicarbonate into carbonate.

• 2 NaHCO3 → Na2CO3 + H2O + CO2

• Then it's crystallized to form the crystals.

• Na2CO3 + 10H2O → Na2CO3.10H2O.

• It is widely used to restore the hardness of water through the chemical process.

• Calcium and magnesium salts react with washing soda to form calcium carbonate and magnesium carbonate.

• These two compounds are insoluble in water and so they precipitate off.

• Thus hard water is restored.

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hard water gets softe on mixing with a solution of washing soda ...