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  4. What is the approximate pH of 1 × 10-3 M NaOH solution?

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Q. What is the approximate $pH$ of $1 \times 10^{-3} M\,NaOH$ solution?

Equilibrium

Solution:

Given $\left[ OH ^{-}\right]=10^{-3}$
$\therefore pOH =3$
$\because pH + pOH =14$
$\therefore pH =14-3=11$