(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.

(i) You have three solutions — A, B, and C having a pH of 6, 2 and 9

1.	(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» (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)

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