Question

You are given a 15% solution of sulphuric acid and a 15% solution of HCN (hydrocyanic acid). Which solution has a higher concentration of $H^{+}$ ions?

• A. Solution of $H_{2}S{O}_4$
• B. Solution of HCN
• C. Both have equal concentration
• D. Data insufficient

Answer 1

The correct option is A Solution of $H_{2}S{O}_4$

Sulphuric acid is stronger as each molecule of sulphuric acid gives out 2 $H^{+}$ ions in comparison to HCN (hydrocyanic acid) which gives only one. Also, pH of sulphuric acid is lower than hydrocyanic acid, which justifies the fact that sulphuric acid is a highly strong as compared to hydrocyanic acid. Hence it will produce a higher concentration of $H^{+}$ ions.