Question

A compound A is used in fire extinguishers, as an antacid and its small amount is also used in making bakery items. Identify the compound and also explain the reason for above mentioned uses of the compound 'A'.

Answer 1

Compound A is sodium hydrogencarbonate-NaHCO₃
(i) It is used in fire extinguishers because it produces CO₂ gas on reaction with acid.
  H₂SO₄ + 2NaHCO₃ ----> Na2SO₄ + 2H₂O + 2CO₂                                                              

(ii) It is used as an antacid because it neutralises excess acid (HCl) present in stomach.
      HCI + NaHCO₃ ----> NaCl + H₂O + CO₂
(iii) It is used in making bakery items because on reaction with acid it produces CO₂ gas which makes bread, cakes, etc., soft and spongy.
  NaHCO₃ + H⁺ ------> H₂O + CO₂ + Na-salt of acid