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$\begingroup$ Ignoring the mistakes in the question or textbook data , Is the formula I derived $$pH=\frac{1}{4}\left(pK_w+pK_a-pK_b\right)$$ correct if I write $\ce{[NH_3]}$ in place of $\ce{[NH_4OH]}$ ie replace $NH_4OH$ by $NH_3+H_2O$ and ignore $ [H_2O] $concentration $\endgroup$
– Aurelius
Commented Mar 16 at 21:22
$\begingroup$ No, it is wrong. $\endgroup$
– Poutnik
Commented Mar 16 at 21:41

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