Methods for Quantitating Impurity

[boredbluejay]

Homework Statement

Which of the following allows you to quantitatively determine the composition of a crude product after synthesis? Explain.
a. NMR
b. melting point
c. TLC

Homework Equations

none

The Attempt at a Solution

I know that TLC is used for determining whether an impurity is present or not, so I don't think it can determine how much of an impurity there is. I'm not sure about NMR and melting point though. Please help?

 

[Borek]

What quantitative methods do you know? How do they work?

What is the integration curve in NMR?