Give suitable reason for the following statements:

CBSE Class 10 CBSE Class 10 Science
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1

Give suitable reason for the following statements:

  1. We feel burning sensation in the stomach when we overeat.
  2. The crystals of washing soda change to white powder on exposure to air.
  3. An aqueous solution of sodium chloride is neutral but an aqueous solution of sodium carbonate is basic.

Answer:

  1. When we overeat excess of acid is produced in the stomach which causes burning sensation.
  2. Washing soda is sodium carbonate decahydrate which when exposed to air loses 10 molecules of water and changes to white powder.
  3. Sodium chloride is a salt of strong acid HCl and strong base NaOH, so it is neutral
    Sodium carbonate is a salt of weak acid H2C03 and strong base NaOH, so it is basic.