Chemistry
Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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### Tartaric Acid Ionization

Tartaric acid is found in many fruits, including grapes, and is partly responsible for the dry texture of certain wines. As a diprotic acid, it has two dissociation constants, \( K_{\text{a1}} = 1.00 \times 10^{-3} \) and \( K_{\text{a2}} = 4.60 \times 10^{-5} \).

**a. Write the equation for the 1st ionization of tartaric acid.**

\[ \text{H}_2\text{C}_4\text{H}_4\text{O}_6 (aq) \rightleftharpoons \text{H}^+ (aq) + \text{HC}_4\text{H}_4\text{O}_6^- (aq) \]

**b. Write the equation for the 2nd ionization of tartaric acid.**

\[ \text{HC}_4\text{H}_4\text{O}_6^- (aq) \rightleftharpoons \text{H}^+ (aq) + \text{C}_4\text{H}_4\text{O}_6^{2-} (aq) \]

**c. Write the \( K_a \) expression for the 1st ionization.**

\[ K_{\text{a1}} = \frac{[\text{H}^+][\text{HC}_4\text{H}_4\text{O}_6^-]}{[\text{H}_2\text{C}_4\text{H}_4\text{O}_6]} \]

**d. Write the \( K_a \) expression for the 2nd ionization.**

\[ K_{\text{a2}} = \frac{[\text{H}^+][\text{C}_4\text{H}_4\text{O}_6^{2-}]}{[\text{HC}_4\text{H}_4\text{O}_6^-]} \]

**e. What is the equilibrium concentration of the reactants and products from the 1st ionization of a 0.250 M solution of tartaric acid?**

To solve, use the initial concentration and the \( K_a \) expression for the 1st ionization
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Transcribed Image Text:### Tartaric Acid Ionization Tartaric acid is found in many fruits, including grapes, and is partly responsible for the dry texture of certain wines. As a diprotic acid, it has two dissociation constants, \( K_{\text{a1}} = 1.00 \times 10^{-3} \) and \( K_{\text{a2}} = 4.60 \times 10^{-5} \). **a. Write the equation for the 1st ionization of tartaric acid.** \[ \text{H}_2\text{C}_4\text{H}_4\text{O}_6 (aq) \rightleftharpoons \text{H}^+ (aq) + \text{HC}_4\text{H}_4\text{O}_6^- (aq) \] **b. Write the equation for the 2nd ionization of tartaric acid.** \[ \text{HC}_4\text{H}_4\text{O}_6^- (aq) \rightleftharpoons \text{H}^+ (aq) + \text{C}_4\text{H}_4\text{O}_6^{2-} (aq) \] **c. Write the \( K_a \) expression for the 1st ionization.** \[ K_{\text{a1}} = \frac{[\text{H}^+][\text{HC}_4\text{H}_4\text{O}_6^-]}{[\text{H}_2\text{C}_4\text{H}_4\text{O}_6]} \] **d. Write the \( K_a \) expression for the 2nd ionization.** \[ K_{\text{a2}} = \frac{[\text{H}^+][\text{C}_4\text{H}_4\text{O}_6^{2-}]}{[\text{HC}_4\text{H}_4\text{O}_6^-]} \] **e. What is the equilibrium concentration of the reactants and products from the 1st ionization of a 0.250 M solution of tartaric acid?** To solve, use the initial concentration and the \( K_a \) expression for the 1st ionization
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