[17-19] Nitrite ion, NO2, is a preservative for bacon and other foods, but it is

Question

[17-19] Nitrite ion, NO2, is a preservative for bacon and other foods, but it is potentially carcinogenic. A spectrophotometric determinationof NO2 makes use of the following reactions:

Here is an abbreviated procedure for the determination:

1. To 50.0 mL of unknown solution containing nitrite is added 1.00 mL of sulfanilic acid solution.

2. After 10min, 2.00 mL of 1-aminonaphthalene solution and

1.00 mL of buffer are added.

3. After 15 min, the absorbance is read at 520 nm in a 5.00-cm cell.

The following solutions were analyzed:

A. 50.0 mL of food extract known to contain no nitrite (that is, a

negligible amount); final absorbance = 0.153.

B. 50.0 mL of food extract suspected of containing nitrite; final absorbance= 0.622.

C. Same as B, but with 10.0 L of 7.50  103 M NaNO2 added

to the 50.0-mL sample; final absorbance = 0.967.

(a) Calculate the molar absorptivity of the colored product. Remember that a 5.00-cm cell was used.

(b) How many micrograms of NO2 were present in 50.0 mL of food extract?

Explanation / Answer

Here is what I solved before, please modify the figures as per your question. Please let me know if you have further questions. Ifthis helps then kindly rate 5-stars

Nitrite ion, NO2-, is a preservative for bacon and other foods, but it is potentially carcinogenic.

Here is an abbreviated procedure for the spectrophotometric determination of NO2-.

1. To 50.0 mL of unknown solution containing nitrite is added 1.00 mL of sulfanilic acid solution.

2. After 10 min, 2.00 mL of 1-aminonaphthalene solution and 1.00 mL of buffer are added.

3. After 15 min, the absorbance is read at 520 nm in a 5.00 cm cell.

The following solutions were analyzed.

A.) 50.0 mL of food extract known to contain no nitrite (i.e., a negligible amount); final absorbance = 0.150.

B.) 50.0 mL of food extract is suspected of containing nitrite; final absorbance = 0.622.

C.) Same as B, but with 10.0

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