[LHM]

I've attached the pictures as documents because I don't know how to add it here.

When a 0.1 M solution of glycine hydrochloride is titrated against 0.18 M NaOH(aq), titration curve I is obtained. When the experiment is repeated with a 0.1 M solution of 'X' hydrochloride instead of glycine chloride, curve II is obtained.

Which of the following molecules could be 'X'?
(see attached document for the choices)

So the titration curve shows that more NaOH is required to neutralize 'X', but how does this correspond to the molecules?

[Hybrid]

first you should know that HCl salt is more acidic than COOH.
and 2nd curve tell you that cpd has 2 basic amino so , it is di salt .
then now i think you can find which di-basic amino acid is X

[LHM]

I'm sorry but what's cpd?

[Borek]

Compound.

That's what happens when people ignore forum rules. They clearly state that we should use plain English, not some kind of textese.

[vmelkon]

Probably E because it is a double acid. It has 2 COOH therefore it can release 2 H+.
I'm not sure because these are organic compounds and the H+ is difficult to break off.