major species in citric acid during titration of a strong base Chemistry 106 Par

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major species in citric acid during titration of a strong base

Chemistry 106 Part 2 Polyprotic acids Focus Question: What are the major species in solution during the HO titration of citric acid with a strong base? Citric acid is a weak organic acid that occurs naturally in citru a flavoring and preservative in food and beverages, especial tri protic acid. Although its formula the pres hydrogens attached to the three carboxylic groups (cooH) ar you will calculate 8 data points of a titration of 100 mL of NaoH and then draw the graph. Table 15.3 Acid dissociation constants of citric acid. 7.5 x 104 1.7 x 10-5 4.0 x 10-7

Explanation / Answer

Citric acid (a weak base) when titrated by NaOH (a strong base) following reaction occur.

H3C6H5O7 (s) + 3 NaOH (aq) --> Na3C6H5O7 (aq) + 3 H2O (l)

For a weak acid, value of Ka is small, so only a small amount of product forms, so reactants are the

major species and products are the minor species

Before equivalence point H3C6H5O7 and H2C6H5O7 and H2O are the major species.

At equivalence point H2C6H5O7 and H2O are the major species

After equivalence point OH, H2C6H5O7 and H2O are the major species

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