Treatment of ammonia with phenol in the presence of hypochlorite yields indophenol, a blue product that absrobs light at 625 nm, which can be used for the spectrophotometric determination of ammonia. ocr -OH • NH, indophenol anion To determine the ammonia concentration in a sample of lake water, three samples are prepared. In sample A, 10.0 ml of lake water is mixed with 5 mL of phenol solution and 2 mL of sodium hypochlorite solution, and diluted to 25.0 mL in a volumetric flask. In sample B, 10.0 mL of lake water is mixed with 5 mL of phenol solution, 2 mL of sodium hypochlorite solution, and 2.50 ml of a 5.50 x 104 M ammonia solution, and diluted to 25.0 mlL. Sample C is a reagent blank. It contains 10.0 mL of distilled water, 5 mL of phenol solution, and 2 mL of sodium hypochlorite solution, diluted to 25.0 mL. The absorbance of the three samples is then measured at 625 nm in a 1.00 cm cuvette. The results are shown in the table. Absorbance Sample (625 nm) A 0.401 0.648 0.045 What is the molar absorptivity (e) of the indophenol product? c = 4.5 x10 M'cm What is the concentration of ammonia in the lake water? [NH, luke water 22 x10-4 Incorrect

Treatment of ammonia with phenol in the presence of hypochlorite yields indophenol, a blue product that absrobs light at 625 nm, which can be used for the spectrophotometric determination of ammonia. ocr -OH • NH, indophenol anion To determine the ammonia concentration in a sample of lake water, three samples are prepared. In sample A, 10.0 ml of lake water is mixed with 5 mL of phenol solution and 2 mL of sodium hypochlorite solution, and diluted to 25.0 mL in a volumetric flask. In sample B, 10.0 mL of lake water is mixed with 5 mL of phenol solution, 2 mL of sodium hypochlorite solution, and 2.50 ml of a 5.50 x 104 M ammonia solution, and diluted to 25.0 mlL. Sample C is a reagent blank. It contains 10.0 mL of distilled water, 5 mL of phenol solution, and 2 mL of sodium hypochlorite solution, diluted to 25.0 mL. The absorbance of the three samples is then measured at 625 nm in a 1.00 cm cuvette. The results are shown in the table. Absorbance Sample (625 nm) A 0.401 0.648 0.045 What is the molar absorptivity (e) of the indophenol product? c = 4.5 x10 M'cm What is the concentration of ammonia in the lake water? [NH, luke water 22 x10-4 Incorrect

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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Question

Treatment of ammonia with phenol in the presence of hypochlorite yields indophenol, a blue product that absrobs light at
625 nm, which can be used for the spectrophotometric determination of ammonia.
ocr
SHN + HO-
indophenol anion
To determine the ammonia concentration in a sample of lake water, three samples are prepared. In sample A, 10.0 mL of
lake water is mixed with 5 mL of phenol solution and 2 mL of sodium hypochlorite solution, and diluted to 25.0 mL in a
volumetric flask. In sample B, 10.0 mL of lake water is mixed with 5 mL of phenol solution, 2 mL of sodium hypochlorite
solution, and 2.50 mL of a 5.50 x 104 M ammonia solution, and diluted to 25.0 mL. Sample C is a reagent blank. It
contains 10.0 mL of distilled water, 5 mL of phenol solution, and 2 mL of sodium hypochlorite solution, diluted to
25.0 mL. The absorbance of the three samples is then measured at 625 nm in a 1.00 cm cuvette. The results are shown in
the table.
Absorbance
Sample
(625 nm)
A
0.401
В
0.648
0.045
What is the molar absorptivity (e) of the indophenol product?
4.5 x103
M-'cm-
What is the concentration of ammonia in the lake water?
[NH,1ake water
2.2 x10
Incorrect

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