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A 1.00 g impure sample containing sodium carbonate and sodium bicarbonate is titrated with 0.1 M HCL. A first end point is determined with phenolphtalein at 15.5. mL, a second end point is determined with methyl red at 40.1 mL. Find the weight percentages of sodium carbonate and sodium bicarbonate in the sample. pH transition ranges, phenolphthalein: 8.0-9.6; methyl red: 4.8-6.0 H2CO3, ka, = 4.46x10-7; ka, = 4.69x10-11 FM: NazCO3 = 106 g/mol; NaHCO3 = 84 g/mol %3D %3D

A 1.00 g impure sample containing sodium carbonate and sodium bicarbonate is titrated with 0.1 M HCL. A first end point is determined with phenolphtalein at 15.5. mL, a second end point is determined with methyl red at 40.1 mL. Find the weight percentages of sodium carbonate and sodium bicarbonate in the sample. pH transition ranges, phenolphthalein: 8.0-9.6; methyl red: 4.8-6.0 H2CO3, ka, = 4.46x10-7; ka, = 4.69x10-11 FM: NazCO3 = 106 g/mol; NaHCO3 = 84 g/mol %3D %3D

Chemistry
Chemistry
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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
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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**Title: Determining the Composition of a Sodium Carbonate and Sodium Bicarbonate Sample** A 1.00 g impure sample containing sodium carbonate and sodium bicarbonate is titrated with 0.1 M HCl. During the titration process, two endpoints are identified. The first endpoint is detected using phenolphthalein at 15.5 mL, and the second endpoint is determined using methyl red at 40.1 mL. **Objective:** Find the weight percentages of sodium carbonate and sodium bicarbonate in the sample. **Indicators and Their pH Transition Ranges:** - **Phenolphthalein:** 8.0 - 9.6 - **Methyl Red:** 4.8 - 6.0 **Chemical Equilibria Constants:** - \( \text{H}_2\text{CO}_3, \, k_{a_1} = 4.46 \times 10^{-7} \) - \( k_{a_2} = 4.69 \times 10^{-11} \) **Formula Masses:** - \( \text{Na}_2\text{CO}_3 = 106 \, \text{g/mol} \) - \( \text{NaHCO}_3 = 84 \, \text{g/mol} \) This procedure provides insight into quantitatively analyzing a mixture to determine the individual components' contributions based on titration results and known chemical properties.
Transcribed Image Text:**Title: Determining the Composition of a Sodium Carbonate and Sodium Bicarbonate Sample** A 1.00 g impure sample containing sodium carbonate and sodium bicarbonate is titrated with 0.1 M HCl. During the titration process, two endpoints are identified. The first endpoint is detected using phenolphthalein at 15.5 mL, and the second endpoint is determined using methyl red at 40.1 mL. **Objective:** Find the weight percentages of sodium carbonate and sodium bicarbonate in the sample. **Indicators and Their pH Transition Ranges:** - **Phenolphthalein:** 8.0 - 9.6 - **Methyl Red:** 4.8 - 6.0 **Chemical Equilibria Constants:** - \( \text{H}_2\text{CO}_3, \, k_{a_1} = 4.46 \times 10^{-7} \) - \( k_{a_2} = 4.69 \times 10^{-11} \) **Formula Masses:** - \( \text{Na}_2\text{CO}_3 = 106 \, \text{g/mol} \) - \( \text{NaHCO}_3 = 84 \, \text{g/mol} \) This procedure provides insight into quantitatively analyzing a mixture to determine the individual components' contributions based on titration results and known chemical properties.
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