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Mar 16 at 21:41 comment added Poutnik No, it is wrong.
Mar 16 at 21:22 comment added Aurelius 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
Mar 9 at 19:01 history edited Poutnik CC BY-SA 4.0
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Mar 9 at 13:55 history undeleted Poutnik
Mar 9 at 13:55 history edited Poutnik CC BY-SA 4.0
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Mar 9 at 13:27 history edited Poutnik CC BY-SA 4.0
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Mar 9 at 13:05 history answered Poutnik CC BY-SA 4.0