Mr. Clean recently bought a laboratory-grade sodium carbonate from a chemical company known as Brand X. He was supposed to use it in the production of detergents. Unfortunately, he was scammed by the company. He suspected that he purchased a crude so- dium carbonate so he tasked the Quality Assurance Department to determine the components of the purchased chemical. The chem- ist assigned to analyze the sample used double indicator method. For the standardization of HCI titrant, 0.1025 g Na2CO3 of 99.5% purity (FW: 106.00) required 8.20 mL of the titrant to reach the phe- nolphthalein endpoint. FW: NaOH (40.00), NaHCO3 (84.01), Na2CO3 (106.00) a. What is the molarity of the titrant? (use significant figures) The chemist obtained a 3.150 g sample and dissolved it in distilled water to produce a 50.0 mL solution. An aliquot of 10.00 mL was obtained and diluted in a 100.0 mL volumetric flask. A 50.00-mL aliquot of the diluted sample was taken and it required 25.70 mL of titrant for the methyl orange endpoint, while another 50.00-mL aliquot required 15.00 mL for the phenolphthalein endpoint. b. What is/are the major component/s of the sample? c. What are the V (volume from start to phenolphthalein) and V. (volume from phenolphthalein to methyl orange) for the 50.00-mL aliquots? Reminder: Follow proper significant figure rules V = Answer! mL Vo = Answer mL d. Calculate the moles and percent composition (%w/w) of each component in the sample. If the component is not present, simply type in "0". mol NaOH = Answer mol mol Na2CO3 = Answer mol NaHCO3 = Answer mol %NaOH = Answer % %Na2CO3 = Answer %NaHCO3 = Answer % mol

Principles of Modern Chemistry

8th Edition

ISBN:9781305079113

Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Chapter15: Acid–base Equilibria

Section: Chapter Questions

Problem 99AP

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Transcribed Image Text:Mr. Clean recently bought a laboratory-grade sodium carbonate from a chemical company known as Brand X. He was supposed to use it in the production of detergents. Unfortunately, he was scammed by the company. He suspected that he purchased a crude so- dium carbonate so he tasked the Quality Assurance Department to determine the components of the purchased chemical. The chem- ist assigned to analyze the sample used double indicator method. For the standardization of HCI titrant, 0.1025 g Na2CO3 of 99.5% purity (FW: 106.00) required 8.20 mL of the titrant to reach the phe- nolphthalein endpoint. FW: NaOH (40.00), NaHCO3 (84.01), Na2CO3 (106.00) a. What is the molarity of the titrant? (use significant figures) The chemist obtained a 3.150 g sample and dissolved it in distilled water to produce a 50.0 mL solution. An aliquot of 10.00 mL was obtained and diluted in a 100.0 mL volumetric flask. A 50.00-mL aliquot of the diluted sample was taken and it required 25.70 mL of titrant for the methyl orange endpoint, while another 50.00-mL aliquot required 15.00 mL for the phenolphthalein endpoint. b. What is/are the major component/s of the sample? c. What are the V (volume from start to phenolphthalein) and V. (volume from phenolphthalein to methyl orange) for the 50.00-mL aliquots? Reminder: Follow proper significant figure rules V = Answer! mL Vo = Answer mL d. Calculate the moles and percent composition (%w/w) of each component in the sample. If the component is not present, simply type in "0". mol NaOH = Answer mol mol Na2CO3 = Answer mol NaHCO3 = Answer mol %NaOH = Answer % %Na2CO3 = Answer %NaHCO3 = Answer % mol

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