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If the concentration of[NH(4)^(+)] in a ...

If the concentration of`[NH_(4)^(+)]` in a solution having 0.02 M `NH_(3)`and 0.005 M Ca `( OH)_(2)` is `a xx 10^(-6) ` M,determine a.
`[k_(b) ( NH_(3)) = 1.8 xx 10^(-5) ]`

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