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Question: If the pH of a solution is 2, the hydrogenion concentration in moles per litre is....

If the pH of a solution is 2, the hydrogenion concentration in moles per litre is.

A

I2I_{2}

B

0.068molL−10.068molL^{- 1}

C

1.020molL−11.020molL^{- 1}

D

0.10molL−10.10molL^{- 1}

Answer

0.068molL−10.068molL^{- 1}

Explanation

Solution

: pH = −log⁡[H+]- \log\left\lbrack H^{+} \right\rbrack

2 = - log [H+]\left\lbrack H^{+} \right\rbrack

[H+]=1×10−2\lbrack H^{+}\rbrack = 1 \times 10^{- 2}