Today

Supposed to be yesterday...

End points and Equivalence points.

End point

This is a point where the indicator used in the titration experiment changes colour.

Equivalence point

This is the point where the amount of titrant is equal to the amount of analyte in the sample. However, we should not mistake the equivalence point has equal volume of analyte and titrant. This is subjected to the concentration or nature (dibasic, monobasic, etc.) of the titrant or analyte.

Eg. 10cm3 of 1.0mol/dm3 NaOH would need 20cm3 of 0.5mol/dm3 HCl.
or
Eg. 10cm3 of 1.0mol/dm3 H2SO4 would need 20cm3 of 1.0mol/dm3 NaOH

So, when choosing an indicator for titration, the end point of the indicator should be exactly at the equivalence point of the titration experiment (pH 7). Known indicators suitable for titration would be methyl orange or penolphthalein as their end point is at pH 7, the equivalence point.

P.S. Jesslyn, thx again for reminding me again this morning... Haha