A 1.5M-labeled HCI solution was standardized against 1g sodium carbonate Na₂CO3 (MW = 105.99 g/mol) following the chemical equation below. The Na₂CO3 standard required 12.7 mL of the HCI solution to completely react up to the indicator endpoint. Standardization reaction: 2HCI + Na₂CO3 -> H₂CO3 + 2NaCl After this, Carla and Marie both prepared their samples by taking 10.0-mL aliquots of each household ammonia solution and diluting them to 25.0 mL. Using the same titrant and indicator, Carla's ammonia solution (Brand A) required 20 mL of the standardized titrant. While Marie's ammonia solution (Brand B) required 45 mL of the same titrant. A. What is the exact concentration of the HCI titrant in molarity? B. What is the balanced chemical equation between the analyte and the titrant? What is the ammonia concentration of Carla's and Marie's samples in molarity? C. If the acceptable range of NH3 concentration for commercial household ammonia is 2.9-4.9M, which of the Brands can be sold commercially?
A 1.5M-labeled HCI solution was standardized against 1g sodium carbonate Na₂CO3 (MW = 105.99 g/mol) following the chemical equation below. The Na₂CO3 standard required 12.7 mL of the HCI solution to completely react up to the indicator endpoint. Standardization reaction: 2HCI + Na₂CO3 -> H₂CO3 + 2NaCl After this, Carla and Marie both prepared their samples by taking 10.0-mL aliquots of each household ammonia solution and diluting them to 25.0 mL. Using the same titrant and indicator, Carla's ammonia solution (Brand A) required 20 mL of the standardized titrant. While Marie's ammonia solution (Brand B) required 45 mL of the same titrant. A. What is the exact concentration of the HCI titrant in molarity? B. What is the balanced chemical equation between the analyte and the titrant? What is the ammonia concentration of Carla's and Marie's samples in molarity? C. If the acceptable range of NH3 concentration for commercial household ammonia is 2.9-4.9M, which of the Brands can be sold commercially?
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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PROBLEM SOLVING Show complete solutions for each of the problems.
Express your final answers in 2 decimal places.
3. Household ammonia, NH3, are used as cleaning solutions manufactured by adding
ammonia gas to water and can be between 2.94 M and 5.87 M. Two students, Carla and
Marie, wish to determine concentration of NH3 present in Brand A and Brand B using
HCI.
A 1.5M-labeled HCI solution was standardized against 1g sodium carbonate Na₂CO3
(MW 105.99 g/mol) following the chemical equation below. The Na₂CO3 standard
required 12.7 mL of the HCI solution to completely react up to the indicator endpoint.
=
Standardization reaction:
2HCI + Na₂CO3 -> H₂CO3 + 2NaCl
After this, Carla and Marie both prepared their samples by taking 10.0-mL aliquots of
each household ammonia solution and diluting them to 25.0 mL. Using the same titrant
and indicator, Carla's ammonia solution (Brand A) required 20 mL of the standardized
titrant. While Marie's ammonia solution (Brand B) required 45 mL of the same titrant.
A. What is the exact concentration of the HCI titrant in molarity?
B. What is the balanced chemical equation between the analyte and the titrant?
What is the ammonia concentration of Carla's and Marie's samples in molarity?
C. If the acceptable range of NH3 concentration for commercial household ammonia is
2.9-4.9M, which of the Brands can be sold commercially?
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