Which of the following will have the largest $p H ?$

M / 10 H C I

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M / 100 H C I

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M / 10 N a O H

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M / 100 N a O H

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Solution

The correct option is C $M / 10 N a O H$
$p H = - l o g [H^{+}]$
$M / 10 H C l$
$p H = 1$
$M / 100 H C l$
$p H = 2$
$M / 10 N a O H$
$p H = 14 - p O H = 14 - 1 = 13$
$M / 100 N a O H$
$p H = 14 - p O H = 14 - 2 = 12$

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