Explanation Given The concentration of lactic acid solution is 0.10 M . The pH of the solution is 2.44 . Lactic acid ( CH 3 CH ( OH ) COOH ) is a weak acid so it will ionize partially and release H + ions in the aqueous solution. The chemical reaction of lactic acid in aqueous solution with H + ion as a product is, CH 3 CH ( OH ) COOH ( a q ) ⇌ H + ( a q ) + CH 3 CH ( OH ) COO − ( a q ) pH is the negative logarithm in the base 10 of [ H + ] . The concentration of H + ion is calculated by the formula, pH = − log [ H + ] [ H + ] = 10 − pH Where, [ H + ] is the concentration of H + ions. Substitute the value of pH in the above formula. [ H + ] = 10 − pH = 10 − 2 .44 = 3.63 × 10 − 3 M K a is the dissociation constant of acids. Weak acids ionize partially in aqueous solution. So, the dissociation constant of acids is used for determining the extent to which a weak acid ionizes. The initial concentration of lactic acid is 0.10 M and the concentration of H + ion after dissociation is 3.63 × 10 − 3 M . The ICE table for the dissociation reaction of lactic acid is, CH 3 CH ( OH ) COOH ( a q ) ⇌ H + ( a q ) + CH 3 CH ( OH ) COO − ( a q ) Initial: 0.10 M 0 0 Change: − 3.63 × 10 − 3 M 3.63 × 10 − 3 M 3

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Chapter 16, Problem 51E

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To determine: The dissociation constant (Ka) for lactic acid that has one acidic hydrogen.

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Chapter 16, Problem 50E

Chapter 16, Problem 52E

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The dissociation constant ( K a ) for lactic acid that has one acidic hydrogen.

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To determine: The dissociation constant (Ka) for lactic acid that has one acidic hydrogen.

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Chapter 16 Solutions