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What is the approximate OH^(-) ion conce...

What is the approximate `OH^(-)` ion concentration of a `0.150M NH_(3)` solution? `(K_(b)=1.75xx10^(-5))`

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Nitrogen cannot extend its valency from 3 to 5 due to absence of d-orbitals while phosphorus shows penta covalency as.d-orbitals are present in it.
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