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JEE Advanced levelNumerical answerDifficulty 3 of 3ie100

$100 mL$ of $HCl$ of pH 1, $200 mL$ of $HCl$ of pH 2 and $100 mL$ of $0.05 M$ $NaOH$ are mixed. Find the pH of the mixture to two decimal places.

Numerical answer type, tolerance 0.01.

Answer: 1.76

H X^{+}

= 100 \times 0.1 + 200 \times 0.01 = 12

mmol;

OH X^{-}

= 100 \times 0.05 = 5

mmol. Excess

H X^{+}

= 7

mmol in

400 mL

:

[H X^{+}] = 0.0175 M

, so

pH = 1.76

.

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