According to the acid-base titration curve given in the figure, why the curve at half equivalance point is flat?
a.)Due to the buffering capacity of weak acid-conjugate base
b.)Since,pH at half equivalance point is 7.
c.)Because concentration of titrant NaOH is not low.
d.)Since, Ka<10^-4 and assumptions do not work
e.)Since HA concentration is <10^-6 M and proton source from water becomes significant.
a.)Due to the buffering capacity of weak acid-conjugate base.