Experimental pKa values Literature pKa values (malonic) Percent error 2.52 2.82
ID: 1035527 • Letter: E
Question
Experimental pKa values
Literature pKa values (malonic)
Percent error
2.52
2.82
10.6%
5.39
5.69
5.27%
Literature pKa values (oxalic)
Percent error
na
1.23
130%
na
4.19
28.6%
Literature pKa values (phthalic)
Percent error
na
2.89
10.64%
na
5.51
2.18 %
Experimental molar mass
Literature molar mass (malonic)
Percent error
8.779
8.51
10.64
na
Literature molar mass (oxalic)
Percent error
na
5.42
158.6
na
Literature molar mass (phthalic)
Percent error
na
8.40
12.82
HELP!!!! this part at the bottom
(3 points) Sum the % error for each diprotic acid in the table below.
Diprotic acid
% error pKa-1
% error pKa-2
% error molar mass
Total % error
Malonic
Oxalic
Phthalic
Experimental pKa values
Literature pKa values (malonic)
Percent error
2.52
2.82
10.6%
5.39
5.69
5.27%
Literature pKa values (oxalic)
Percent error
na
1.23
130%
na
4.19
28.6%
Literature pKa values (phthalic)
Percent error
na
2.89
10.64%
na
5.51
2.18 %
Explanation / Answer
Total percent Error for a sent of 'n' variables which have individual percent errors as E1 , E2, E......, En is given as the average of individual percent errors i.e (E1 + E2 + E...... + En ) / n.
For Malonic acid (10.6 + 5.27 + 10.64) / 3 = 8.83%
For Oxalic acid ( 130 + 28.6 + 158.6 ) / 3 = 105.73%
For pthalic acid (10.64 + 2.18 + 12.82 ) / 3 = 8.54%
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