Question

why is it not practical to titrate acid or base that is too dilute

Answer 1

Acid and base which are too dilute have their P^H near 7, in case of acid-base titration we use indicator to detect the end point,

When acid is too dilute and base is concentrated, even a single drop of base can react with large amount of acid in terms of volume, in such case colour change of indicator may not be accurate, this leads to error in the titration value or equivalent point of titration.

Moreover for small quantity of concentrated acid large amount of dilute base may be required and vice versa.

Hence it is better to have almost same concentration solutions during titration

Even when both acid and base are equally too dilute the colour change of indicator is gradual, detection of end point becomes difficult, for a acid-base titration we need abrupt colour change of indicator