Question

what effect does dillution of the buffer have on the intial pH?on the pH at the end point ?on the volume of HCl required to reach the end point?

Answer 1

Assume this is a basic buffer, since HCl is being added...

If this is a buffer, then the pH should not change drstically

this is given

pOH = pKb + log(BH+/B)

since (BH+/B) ratio is kept

then pOH = pKb +log(ratio)

remains

since pKb is constant as well

b)

the pH in the END point will be HIGHER , that is, the concentration is less, so the H+ is less

i.e. the pH is nearest to 7 when it gets diluted, since final volume increases

c)

volume of HCl will be the SAME, since initial amount of B present will be the same