5th Edition

ISBN: 9781285199047

Author: John W. Moore, Conrad L. Stanitski

Publisher: Cengage Learning

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An acid-base titration is the method of quantitative analysis for determining the concentration of an acid and base by exactly neutralizing it with a standard solution of base or acid having known concentration.

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Textbook Question

Chapter 3, Problem 93QRT

A soft drink contains an unknown mass of citric acid, C₃H₅O(COOH)₃. It requires 6.42 mL of 9.580 × 10⁻²-M NaOH to neutralize the citric acid in 10.0 mL of the soft drink.

C₃H₅O(COOH)₃(aq) + 3 NaOH(aq) → Na₃C₃H₅O(COO)₃(aq) + 3 H₂O(ℓ)

(a) Determine which step in these calculations for the mass of citric acid in 1 mL soft drink is incorrect? Why?
1. (i) n (NaOH) = (6.42 mL)(1 L/1000 mL)(9.580 × 10⁻² mol/L)
2. (ii) n (citric acid) = (6.15 × 10⁻⁴ mol NaOH) × (3 mol citric acid/l mol NaOH)
3. (iii) m (citric acid in sample) = (1.85 × 10⁻³ mol citric acid) × (192.12 g/mol citric acid)
4. (iv) m (citric acid in 1 mL soft drink) = (0.354 g citric acid)/(10 mL soft drink)
(b) Determine the correct result.

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Chapter 3, Problem 92QRT

Chapter 3, Problem 94QRT

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