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CHEMISTRY

JAMB 2000 - Question 24

Chemistry 2000 JAMB Past Questions - Question 24: The pOH of a solution of 0.25 mol dm−³ of hydrochloric acid is

Choose the correct answers from the options given.

The pOH of a solution of 0.25 mol dm−³ of hydrochloric acid is

A: 12.40

B: 13.40

C: 14.4

D: 14.6

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Correct Answer

Explanation

pOH =-log(2.5*10-1) =-log(-0.3979+1) =13.40
To find the pOH of a solution of hydrochloric acid, you can use the formula:

pOH = -log[OH⁻]

Since hydrochloric acid is a strong acid, it completely dissociates in water to form H⁺ ions and Cl⁻ ions. There are no OH⁻ ions present in the solution. Therefore, the pOH of a solution of hydrochloric acid is 14 (the pOH of a neutral solution at 25°C).