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JEE Main levelNumerical answerDifficulty 2 of 3ie083

$1 L$ of $NaOH$ solution of pH 10 is mixed with $1 L$ of $NaOH$ solution of pH 13 at 298 K. Find the pH of the mixture to two decimal places.

Numerical answer type, tolerance 0.01.

Answer: 12.7

[OH X^{-}]

values are

1 0^{- 4}

and

1 0^{- 1} M

. Mixed:

[OH X^{-}] = (1 0^{- 4} + 1 0^{- 1}) /2 = 0.05005 M

,

pOH = 1.3006

, so

pH = 12.70

.

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