Question

(i) You have three solutions — A, B, and C having a pH of 6, 2 and 9 respectively. Arrange these solutions in increasing order of hydrogen ion concentration. Which of the three is most acidic? What happens to the hydrogen ion concentration in A as it is diluted?
(ii) If someone is suffering from a stomach problem called acidity, why is a solution of baking soda offered as a remedy?
(iii) Write chemical name and formula of baking soda.

Answer 1

(i) (a) The order of increasing hydrogen ion concentration is C < A < B. Higher the pH value, lower is the hydrogen ion concentration.
(b) B is most acidic as it has least pH value.
(c) Hydrogen ion concentration decreases on dilution.
(ii) Baking Soda is a mild base and neutralises the excess acid in the stomach.
(iii) Baking Soda: Sodium hydrogen carbonate (NaHCO₃)