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
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
Chapter20: Molecular Spectroscopy And Photochemistry
Section: Chapter Questions
Problem 67CP
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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](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fc643935f-4f47-46f6-88e1-7f420e1d3946%2Faef48e94-59b7-4173-8e56-0ad678d13112%2Fn8xhsa_processed.jpeg&w=3840&q=75)
Transcribed Image Text: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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