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Calculate the pH of the solution in whic...

Calculate the pH of the solution in which `0.2 M NH_(4)Cl` and `0.1 M NH_(3)` are present. The `pK_(b)` of ammonia solution is `4.75`.

Text Solution

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The correct Answer is:
9
`pOH = pK_(b) + log .(["Salt"])/(["Base"])=4.75 + log.(0.2)/(0.1)`
`=4.75+ log 2 = 4.75 + 0.3010 ~=5.0`
`:. pH = 14 - 5.0 = 9`.
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