Explain what is the ph after the addition of nh3

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A 50.0mL sample of 0.0240 M NH3(aq) is titrated with aqueous HCl. What is the pH after the addition of 15.0mL of 0.0600 M HCl(aq) kb of NH3= 1.8x10^-5.

choices:

a) 878

b)9.73

c)8.86

d)9.25

e)9.38

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