[speed]

Hi all
I need your urgently help of this please
 
I have p-touluenesulphoric acid as a solid phase, and need to know what the concentration of it.
As the manufacture it includes 97.5% PTSA and 0.3% sulfuric acid.

I know the PKa that -2.8 (from Wikipedia) but I need to calculate the PH that should be the end point in order inserts it to the titration machine. How can I calculate it?? 

The second point that I need to know also the concentration of the sulfuric acid that's should be around 0.3%.  and the PKa is -3 (from Wikipedia) How can I calculate it?? 

After knowing the PH end point should I get two curves??
This titration at aqueous medium with NaoH, should that be accurate ??

Thanks

[Borek]

You will be not able to determine both acids separately from the titration, only their sum, and you will get one titration curve.

These are both strong acids. See http://www.titrations.info/acid-base-titration-equivalence-point-calculation

Note that you would get much better accuracy determining amount of impurities and assuming acids are reast of the mixture.

[speed]

But I am also will not be able to titrate it at aqueous medium because it will not be accurate, http://en.wikipedia.org/wiki/Acid_dissociation_constant. And I haven't non-aqueous electrode in order to titrate it at solvent medium.
I need to determine the both acids. 

I know that I can determine it at HPLC, but unfortunately I haven't.
There is also method at spectrophotometer... If you know it pleases!!!

Thanks

[speed]

Anyone have a good method to detremine PTSA ??