Question

Review Topics] Use the References to access important values if needed for this q uestion. Remember to use scientific notation for very small or very large naabers An aqueous solution has a hydrogen ion concentration of 7.62x102 M (1) What is the hydroxide ion concentration in this solution? (2) What is the pOH of this solution? (3) What is the pH of this solution? 7 more group attempts remaining Subrnit Anse

Answer 1

Given,

[H⁺] = 7.62 x 10^-2 M

Autoionization constant of water, K_w = 10^-14 at 25 ^oC

Now,

K_w = [H⁺][OH^-] = 10^-14

or, [OH^-] = 10^-14/(7.62 x 10^-2)

                 = 1.31 x 10^-13 M

Hence, the concentration of OH^- = 1.31 x 10^-13 M

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Now, pOH = - log[OH^-]

                 = - log(1.31 x 10^-13)

                 = 12.9

Hence, the pOH of the solution = 12.9

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pH = -log[H⁺]

or, pH = -log(7.62 x 10^-2)

or, pH = 1.12

Hence, the pH of the solution = 1.12