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A buffer solution is prepared in which t...

A buffer solution is prepared in which the concentration of `NH_3` is 0.30(M) and the concentration of `NH_4^+` is 0.20(M). The equilibrium constant `K_b` for `NH_3` equals `1.8xx10^(-5)`. What is the pH of this solution-

A

8.73

B

9.08

C

9.43

D

11.72

Text Solution

Verified by Experts

`K_b=1.8xx10^(-5),pK_b=-log_(10)(1.8xx10^(-5))=4.74`
`pH=14-pOH=14-(pK_b+log([NH_4^+])/(NH_3])`
`=14-(4.74+log(0.2)/(0.3))=9.43`
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