What is the pH of an aqueous solution at 25.0°C in which [H⁺] is 0.0025 M? A)5.99 B)2.60 C)-2.60 D)-5.99 E)none of the above

Question

Quizplus · Accepted Answer

The first step is to write the balanced equation for the dissociation of H2S: H2S ⇌ HS- + H+ From this equation, it is clear that the concentration of HS- (and therefore also H+) is equal to [H⁺] since H2S is a weak acid and only partially dissociates. Therefore, [H+] = [HS-] = 0.0025 M. To calculate the pH, we use the equation: pH = -log[H+] Plugging in the value of [H+], we get: pH = -log(0.0025) = 2.60 Therefore, the answer is B.

What Is the PH of an Aqueous Solution at 25