If 50ml of acid and .100 M NaOH was used for both titrations. 1.Calculate the co

Question

If 50ml of acid and .100 M NaOH was used for both titrations.
1.Calculate the concentrations of the maleic and fumaric acid solutions. 2. For maleic acid, use your titration curve to estimate pKa1 and pKa2. 3. For maleic acid, use the estimated pKa1 and pKa2 to calculate Ka1 and Ka2. 1.Calculate the concentrations of the maleic and fumaric acid solutions. 2. For maleic acid, use your titration curve to estimate pKa1 and pKa2. 3. For maleic acid, use the estimated pKa1 and pKa2 to calculate Ka1 and Ka2. 4. For fumaric acid, use your titration curve to estimate a pKa value for the visible equivalence point. 5. In the fumaric acid titration, at what volume of NaOH should the missing equivalence point show up? Why?

umanc Acid 10- 20 10 Volume (mL)

Explanation / Answer

Titration

1. concentration of fumaric acid = 0.1 M x 20 ml/50 ml = 0.04 M

concentration of maleic acid = 0.1 M x 8.5 ml/50 ml = 0.017 M

2. Maleic acid

pKa1 = 2.12

pKa2 = 5.035

3. For maleic acid

Ka1 = 7.6 x 10^-3

Ka2 = 9.22 x 10^-6

4. Fumaric acid

pKa = 4.67

5. In fumaric acid the equivalence point volume = 20 ml

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