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The concentration of ammonia in a cleaning product was determined by back titration. Firstly, 10.00 cm3 of the cleaning product was pipetted into a large conical flask, containing 250.00cm3 of 0.50 mol/l HCl to give Solution A. Following a period of reaction and shaking, 50.00cm3 of Solution A was removed and diluted to 250 cm3 with water in a volumetric flask to give Solution B. 20 cm3 samples of Solution B were titrated against 0.05 mol/l Na2CO3 solution, giving an average titre of 12.45 cm3 . i) Write equations for the reactions that have taken place. ii) Determine the concentration of NH3 in the original cleaning product in mol/l, g/l, ppm, and % w/v.

The concentration of ammonia in a cleaning product was determined by back titration. Firstly, 10.00 cm3 of the cleaning product was pipetted into a large conical flask, containing 250.00cm3 of 0.50 mol/l HCl to give Solution A. Following a period of reaction and shaking, 50.00cm3 of Solution A was removed and diluted to 250 cm3 with water in a volumetric flask to give Solution B. 20 cm3 samples of Solution B were titrated against 0.05 mol/l Na2CO3 solution, giving an average titre of 12.45 cm3 . i) Write equations for the reactions that have taken place. ii) Determine the concentration of NH3 in the original cleaning product in mol/l, g/l, ppm, and % w/v.

Chemistry
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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The concentration of ammonia in a cleaning product was determined by back titration.
Firstly, 10.00 cm3 of the cleaning product was pipetted into a large conical flask,
containing 250.00cm3 of 0.50 mol/l HCl to give Solution A.
Following a period of reaction and shaking, 50.00cm3 of Solution A was removed and
diluted to 250 cm3 with water in a volumetric flask to give Solution B.
20 cm3 samples of Solution B were titrated against 0.05 mol/l Na2CO3 solution, giving
an average titre of 12.45 cm3
.

i) Write equations for the reactions that have taken place.
ii) Determine the concentration of NH3 in the original cleaning product in mol/l,
g/l, ppm, and % w/v.

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