1 answer

HOOC COOH Maleic Acid Hd 20 40 60 Volume of NaOH (mL) The curve above shows the titration of 250

Question:

HOOC COOH Maleic Acid Hd 20 40 60 Volume of NaOH (mL) The curve above shows the titration of 250 mL of 100 mM maleic acid usi

HOOC COOH Maleic Acid Hd 20 40 60 Volume of NaOH (mL) The curve above shows the titration of 250 mL of 100 mM maleic acid using 1 M NaOH. a) How many titratable protons are present in this acid? [1 marks). b) Indicate on the curve with a "O"the end point titrations of each titratable group. [1 mark) c) Indicate on the titration curve with a clear "X" each pKa value associated with these titratable protons and estimate to the nearest 0.5 unit the value for each pka. [3 marks]

Answers

a) The no. of titratable protons present in Maleic acid = 2

b) ~ 30 mL and ~ 50 mL of NaOH are required for the first and second end-points respectively.

c) pKa1 = 1.92, pKa2 = 6.22

.

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