[kapital]

The question on my the exam was:
Create titration curve for titration of sodium carbonate with HCl. Describe titration and write equations for pH at important titratin points.

I have a questiona:

How can I calculate pH and wich are all important poinst?

[Borek]

http://www.titrations.info/acid-base-titration-curve-calculation

http://www.titrations.info/acid-base-titration-equivalence-point-calculation

Important points are initial (before titration) 50% of the first protonation, 100% of the first protonation (first equivalence point), 50% of the second protonation and the second equivalence point.

[kapital]

Ok. So the firt point(start point) is just pH od sodium carbonate.

What are equations for pH for firs and second equvivalent poins?

[Borek]

There are no simple equations, but the calculation procedure is explained on the pages I linked to. I am not going to repeat it here.