7. A sample of anhydrous NaHCO; (FM = 84.007) is suspected to be contaminated with either NaOH (FM = 39.997) or NazCO3 (FM = 105.989). To verify the suspicion, a 0.7483 g sample was dissolved to prepare a 50.00 mL solution, and a 10.00 mL aliquot was taken to prepare a 100 mL solution, where 25.00 mL was analyzed using double flask method. If the sample requires 0.45 mL of standard 0.0125 N HCI to reach the phenolphthalein endpoint and 35.95 mL to reach the bromcresol green endpoint, calculate the percentage composition (in %w/w) of all the basic components in the sample.
7. A sample of anhydrous NaHCO; (FM = 84.007) is suspected to be contaminated with either NaOH (FM = 39.997) or NazCO3 (FM = 105.989). To verify the suspicion, a 0.7483 g sample was dissolved to prepare a 50.00 mL solution, and a 10.00 mL aliquot was taken to prepare a 100 mL solution, where 25.00 mL was analyzed using double flask method. If the sample requires 0.45 mL of standard 0.0125 N HCI to reach the phenolphthalein endpoint and 35.95 mL to reach the bromcresol green endpoint, calculate the percentage composition (in %w/w) of all the basic components in the sample.
Principles of Instrumental Analysis
7th Edition
ISBN:9781305577213
Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Chapter14: Applications Of Ultraviolet-visible Molecular Absorption Spectrometry
Section: Chapter Questions
Problem 14.6QAP: The accompanying data (1.00-cm cells) were obtained for the spectrophotometric titration 10.00 mL of...
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A sample of anhydrous NaHCO3 (FM = 84.007) is suspected to be contaminated with either
NaOH (FM = 39.997) or Na2CO3 (FM = 105.989). To verify the suspicion, a 0.7483 g sample was dissolved to prepare a 50.00 mL solution, and a 10.00 mL aliquot was taken to prepare a 100 mL solution, where 25.00 mL was analyzed using double flask method. If the sample requires 0.45 mL of standard 0.0125 N HCl to reach the phenolphthalein endpoint and 35.95 mL to reach the bromcresol green endpoint, calculate the percentage composition (in %w/w) of all the basic components in the sample.
Transcribed Image Text:7. A sample of anhydrous NaHCO3 (FM = 84.007) is suspected to be contaminated with either
N2OH (FM = 39.997) or NażCO3 (FM = 105.989). To verify the suspicion, a 0.7483 g sample
was dissolved to prepare a 50.00 mL solution, and a 10.00 mL aliquot was taken to prepare
a 100 ml solution, where 25.00 mL was analyzed using double flask method. If the sample
requires 0.45 mL of standard 0.0125 N HCI to reach the phenolphthalein endpoint and 35.95
mL to reach the bromcresol green endpoint, calculate the percentage composition (in
%w/w) of all the basic components in the sample.
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