First slide

PH of strong acids and strong bases

Question

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

Moderate

A

13.6, 0.4
B

0.4, 13.6
C

0.7, 13.3
D

13.3, 0.7

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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