Even i tried it many times so i thought i should ask this question here.

ok let me know what do u mean by

Volume at 1 equivalent point = 6.54 ml

im confused here

is this the volume of NaOH used from begening to first eqivalence point or anything else

as for diprotic acids , volume of NaOH used at first equivance point may be

90 === 36.22 ml

116 === 28.10 ml

134 === 24.32 ml

150 === 21.73 ml

if

u solve it pls let me know