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.
Related questions
For Fe³⁺(aq) + SCN⁻(aq) ⇌ [Fe(SCN)]²⁺(aq), adding more KSCN causes the Fe³⁺ concentration The solubility of carbon dioxide in a soft drink falls as temperature rises because dissolWhen the temperature of an exothermic reaction at equilibrium is raised, the equilibrium cAdding a catalyst to a reversible reaction at equilibrium:A sealed flask of reacting gases shows no colour change for an hour. What is actually happBesides VSEPR and the Kossel Lewis approach, which two theories are listed?Which theory is abbreviated VSEPR?Why can lattice enthalpy not be calculated directly from attraction and repulsion alone?