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JEE Main levelNumerical answerDifficulty 2 of 3ie079

What volume of water (in mL) must be added to $100 mL$ of $HCl$ solution of pH 2 to change its pH to 3? Give the answer to the nearest integer.

Numerical answer type, answer in mL, tolerance 1.

Answer: 900 mL

[H X^{+}]

falls from

1 0^{- 2}

to

1 0^{- 3} M

, a tenfold dilution. Final volume

= 1000 mL

, so water added

= 1000 - 100 = 900 mL

.

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