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ICSE Class 9 Chemistry Question 18 of 31

Water — Question 15

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15
Question

Question 1(xv)

Sodium chloride (common salt) besides being used in kitchen can also be used as the raw material for making:

P — Slaked lime

Q — Washing soda

R — Baking soda

  1. Only P
  2. Only Q
  3. Only R
  4. Both Q and R
Answer

Both Q and R

Reason — Washing Soda (NaHCO3.10H2O) and baking Soda (NaHCO3) are made from sodium chloride using the Solvay process

NaCl + NH3 + CO2 + H2O ⟶ NaHCO3 + NH4Cl

NaHCO3 is filtered and heated to get sodium carbonate: ​

2NaHCO3 →Δ\xrightarrow{\Delta} Na2CO3 + CO2 + H2O

Sodium carbonate (Na2CO3) is then hydrated to form washing soda.