Titration of Na2CO3 with HCl. You may wantto record your answers in the Data Collection section of your labmanual for use during the lab.(pKa1(H2CO3) = 6.352,pKa2(H2CO3) =10.329).
(a) What are the first and second equivalence volumes(Veq1 and Veq2) when 20.00 mL of 0.10M Na2CO3 is titrated with 0.20M HCl?
Veq1 = ? mL
Veq2 = ? mL
(b) What do you expect the pH to be at the following points
The first midpoint of the titration.
pH =Â Â
The first equivalence point of the titration.
pH =Â Â
The second midpoint of the titration.
pH =
(c) Calculate the pH at each of the following volumes of 0.20M HCl added to 20.00 mL of 0.10 MNa2CO3.
| mL 0.20 M HCl | pH |
| 0.00 | |
| 5.00 | |
| 10.00 | |
| 15.00 | |
| 20.00 | |
| 22.00 |
