40.00-ml sample of a weak base is titrated with 0.0935 m hci. at the endpoint, it is found that 32.87 ml of titrant was used. what was the concentration of the weak base?
A. 0.114 m
B. 0.0768 m
C. 3.07 m
D. 0.0935 m
E. 7.11 x 10⁻⁵