Answer:
pH = 3.12
Explanation:
C7H7NH2 + HCl ---> C7H7NH3+Cl-
moles of C7H7NH2 = 0.027 x 0.063 = 1.7 x 10^-3 mol
moles of C7H7NH2 = moles of HCl at equivalence point
1.7 x 10^-3 = 0.048 x V
V = 0.035 L
volume of HCl = 0.035 L
so C7H7NH3+Cl- salt formed = 1.7 x 10^-3 moles
salt concentration = moles / total volume
= 1.7 x 10^-3 / (0.027 + 0.035) = 0.027M
this salt formed from weak base strong acid . so pH <7
pH = 7 - 1/2 [pKb + logC]
pH = 7 -1/2 [9.33 + logC]
pH = 3.12
