Given below are two statements: Statement I: pH of a $1.0 \times 10^{-8} \, \text{M}$ solution of HCl is 8 at $25^{\circ}C$. Statement II: HCl is a strong acid and negative log of $H^{+}$ concentration is called pH. In the light of the above statements, choose the most appropriate answer from the options given below:
ABoth Statement-I and statement-II are incorrect.
BBoth Statement-I and statement-II are correct.
CStatement-I is incorrect but statement-II is correct.
DStatement-I is correct but statement-II is incorrect.
Answer & Solution
Correct answer: C. Statement-I is incorrect but statement-II is correct.
Statement I is incorrect because in such a very dilute acid, contribution of $H^+$ from water cannot be ignored, so the pH is not 8; it is about 6.8. Statement II is correct: HCl is a strong acid, and pH is defined as $-\log[H^+]$. Hence the correct choice is C.