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Q.

A buffer solution is prepared in which the conc. NH3 is 0.30 M and the concentration of NH4+ is 0.20 M. If the equilibrium constant, Kb for NH3 equals 1.8×10-5, what is the pH of this solution

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a

8.73

b

9.08

c

9.44

d

11.72

answer is C.

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Detailed Solution

pOH=pKb+log[salt][ base ]=4.74+log0.200.30= 4.74 + (0.301- 0.477)= 4.74 - 0.176 =  4.56pH = 14 - 4.56 = 9.44
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