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pH of a Solution

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Question

Calculate the pH of $\frac{N}{1000}$ sodium hydroxide (NaOH) solution assuming complete ionisation.

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Solution

$\frac{N}{1000} N a O H$ . $∴$ Concentration of ${O H}^{(-)}, [{O H}^{(-)}] = 10^{- 3} N$
$∴$ $p O H = - l o g [{O H}^{(-)}] = - l o g 10^{- 3} = 3$
$∴$ $p H = 14 - p O H = 14 - 13 = 11$

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