Consider the titration pf 25.00 mL of 0.100 M weak acid HA whose Ka = 6.80...
Consider the titration pf 25.00 mL of 0.100 M weak acid HA whose Ka = 6.80 X 10-5 with 0.100 M NaOH. Calculate the fractional composition for both HA and A- and the pH at the following titratant volumes in mL.
1, 3, 5, 10, 12, 13, 15, 20, 21, 22, 26, 24
Plot both fractional compositions vs. pH using a scatter plot with a smooth curve through the points.
Homework Answers
|
Volume of NaOH added(ml) |
Composition(NaOH/HA) |
PH |
|
1 |
0.04 |
2.78 |
|
3 |
0.12 |
3.30 |
|
5 |
0.2 |
3.56 |
|
10 |
0.4 |
3.99 |
|
12 |
0.48 |
4.13 |
|
13 |
0.52 |
4.17 |
|
15 |
0.6 |
4.34 |
|
20 |
0.8 |
4.76 |
|
21 |
0.84 |
4.88 |
|
22 |
0.88 |
5.03 |
|
24 |
0.96 |
5.54 |
|
26 |
1.04 |
11.29 |
I didn’t get composition of A- and HA, I simply take NaOH/HA (vol/vol) which will be equal to A- / HA upto 24ml and after that for 26 ml it will be equal to 1.
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Consider the titration pf 25.00 mL of
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