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pH of a Solution

2g of NaOH ...

Question

$2 g$ of $N a O H$ are dissolved in water to make $1 l i t r e$ solution. What is pH of solution?

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Solution

Number of moles of $N a O H = \frac{2}{40} = 0.05$
Concentration of $N a O H$ (Molarity) $= \frac{0.05}{1} = 0.05 m o l a r$
Concentration of $O H^{-}$ ions $= 0.05 M$
$p O H = - l o g 0.05 = 1.30$
$p H + p O H = 14$
$p H = 12.7$

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