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Equal volumes of 0.5M NaOH and 0.3M KOH are mixed. Then the pH and pOH of resulting solution are respectively.

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13.6, 0.4

0.4, 13.6

0.7, 13.3

13.3, 0.7

answer is A.

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Detailed Solution

${[{OH}^{-}]}_{final} = \frac{0.5 \times V + 0.3 \times V}{2 V} = \frac{1}{2} (0.8) {[{OH}^{-}]}_{final} = 0.4 = 4 \times 10^{- 1}$

P^OH = 1 - 2 x0.30 = 0.4

P^H = 13.6

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