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What is the pH of a 0.025 M solution of KOH?(A) 1.60 (B) 3.69 (C) 10.31 (D) 12.40

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lak-86 | Student, Undergraduate | Salutatorian

Posted August 16, 2013 at 3:28 AM via web

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What is the pH of a 0.025 M solution of KOH?
(A) 1.60

(B) 3.69

(C) 10.31

(D) 12.40

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jeew-m | College Teacher | (Level 1) Educator Emeritus

Posted August 16, 2013 at 3:32 AM (Answer #1)

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`KOH rarr (K^+) +(OH^-)`

`P^OH = -log [OH^-]= -log[0.025] = 1.6`

To find` P^H ` we need to use the equation;

`P^Kw = P^H +P^(OH)`

Assuming that the temperature is 25 C;

`14= P^H +1.6`

`P^H = 14 - 1.6 =12.4`

So the `P^H` of the solution is 12.4.

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