2.3 **Titration Problem: Standardizing a Sodium Hydroxide Solution**A chemistry student needs to standardize a fresh solution of sodium hydroxide. He carefully weighs out 231. mg of oxalic acid (H₂C₂O₄), a diprotic acid that can be purchased inexpensively in high purity, and dissolves it in 250. mL of distilled water. The student then titrates the oxalic acid solution with his sodium hydroxide solution. When the titration reaches the equivalence point, the student finds he has used 130.9 mL of sodium hydroxide solution.**Objective:**Calculate the molarity of the student's sodium hydroxide solution. Round your answer to 3 significant digits.**Calculation Steps:**1. **Determine the Moles of Oxalic Acid**: - Given mass of oxalic acid = 231 mg = 0.231 g - Molar mass of oxalic acid (H₂C₂O₄) = 2(1.01 g/mol) + 2(12.01 g/mol) + 4(16.00 g/mol) = 90.04 g/mol - Moles of oxalic acid (n) = mass (g) / molar mass (g/mol) = 0.231 g / 90.04 g/mol ≈ 0.00257 mol2. **Reaction Stoichiometry**: - The balanced equation for the reaction between oxalic acid and sodium hydroxide (NaOH) is: \[ \text{H}_2\text{C}_2\text{O}_4 + 2 \text{NaOH} \rightarrow \text{Na}_2\text{C}_2\text{O}_4 + 2 \text{H}_2\text{O} \] - From the equation, 1 mole of oxalic acid reacts with 2 moles of NaOH. - Moles of NaOH required = 2 × moles of oxalic acid = 2 × 0.00257 mol = 0.00514 mol3. **Volume of Sodium Hydroxide Solution Used**: - Volume of sodium hydroxide solution used = 130.9 mL = 0.1309 L4. **Calculate the Molarity (M) of Sodium Hydroxide Solution**

Given Mass of oxalic acid = 231 mg Volume of NaOH = 130.9 ml

A chemistry student needs to standardize a fresh solution of sodium hydroxide. He carefully weighs out 231. mg of oxalic acid (H,C,04), a diprotic acid that can be purchased inexpensively in high purity, and dissolves it in 250. mL of distilled water. The student then titrates the oxalic acid solutic with his sodium hydroxide solution. When the titration reaches the equivalence point, the student finds he has used 130.9 mL of sodium hydroxide solution. Calculate the molarity of the student's sodium hydroxide solution. Round your answer to 3 significant digits.

A chemistry student needs to standardize a fresh solution of sodium hydroxide. He carefully weighs out 231. mg of oxalic acid (H,C,04), a diprotic acid that can be purchased inexpensively in high purity, and dissolves it in 250. mL of distilled water. The student then titrates the oxalic acid solutic with his sodium hydroxide solution. When the titration reaches the equivalence point, the student finds he has used 130.9 mL of sodium hydroxide solution. Calculate the molarity of the student's sodium hydroxide solution. Round your answer to 3 significant digits.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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