Its probably formol titration.that you are referring to ..where the formaldehyde blocks the amino group of glycine,forming a dimethylol derivative such that glycine instead of behaving like an ampholyte behaves like a carboxylic acid,Now you can treat it like an acid and titrate it with alkali
The titration curve of phenylanaline is around pk value 6.89 which neutral pH. It has a two buffer one in the acidic portion and the neutral one.
Answering "http://wiki.answers.com/Q/Why_the_titration_curve_is_varying_with_different_acid_base_titration"
Without seeing the curve, we can't answer this.
If we plot the pM (M= concentration of metal ion in the analyte) against the volume of titrant the titration curve takes the sigmoidal shape, plateau in the first part, sharp rise around the equivalence point and then again flat.
It is the nearly horizontal region before the equivalence point.
the titration curve
The titration curve of phenylanaline is around pk value 6.89 which neutral pH. It has a two buffer one in the acidic portion and the neutral one.
Answering "http://wiki.answers.com/Q/Why_the_titration_curve_is_varying_with_different_acid_base_titration"
Answering "http://wiki.answers.com/Q/Why_the_titration_curve_is_varying_with_different_acid_base_titration"
Without seeing the curve, we can't answer this.
If we plot the pM (M= concentration of metal ion in the analyte) against the volume of titrant the titration curve takes the sigmoidal shape, plateau in the first part, sharp rise around the equivalence point and then again flat.
It is the nearly horizontal region before the equivalence point.
Assuming you know how to find the equivalence point on the titration curve, and assuming it is not [strong acid/strong base] or [weak acid/weak base], all you need to do is find the half equivalence point, which gives you the pKa of the first solution. Then to get the Ka, you go 10-pKa .
This is so because titration of a weak acid with a weak base do not give a sharp change inconductivity curve. Hence it is not possible to determine the end point from the curve.
check the graph on this site, its a typical example of what to expect. http://terpconnect.umd.edu/~toh/models/TitrationDemo.html
Supply curve will be upward sloping in two reason,the first reason is know as the income effect and the second is know as substitution effect.
The pka of oxalic acid can be determined with the help of titration curve. The slight inflection that occurs corresponds to the first end point.