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Chapter 18: Q19P (page 457)

If a sample for spectrophotometric analysis is placed in a 10 - cmcell, the absorbance will be 10times greater than the absorbance in a 1 - cmcell. Will the absorbance of the reagent-blank solution also be increased by a factor of 10?

Short Answer

Expert verified

Yes, the absorbance of the reagent-blank solution also be increased by a factor of 10.

Step by step solution

01

Define Reagent Blank Solution

A reagent blank is a mixture of any solvent and reagent that would be presented to the detector for analysis of a test sample and is analysed to determine if it contributes to the measurement signal.

02

Reaction of Solution

Yes, the absorbance of the reagent-blank solution also be increased by a factor of 10.

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Most popular questions from this chapter

Semi-xylenol orange is a yellow compound at pH 5.9but turns red when it reacts with Pb2+. A 2.025 - mLsample of semixylenol orange at pH 5.9was titrated with7.515脳10-4MPb(NO3)2with the following results:

Total role="math" localid="1663647483742" 渭尝Pb2+added

Absorbance at 490nmwavelength

Total 渭尝Pb2+added

Absorbance at490nmwavelength

0.0

6.0

12.0

18.0

24.0

30.0

36.0

0.227

0.256

0.286

0.316

0.345

0.370

0.399

42.0

48.0

54.0

60.0

70.0

80.0


0.425

0.445

0.448

0.449

0.450

0.447


Make a graph of absorbance versus microliters of Pb2+added. Be sure to correct the absorbances for dilution. Corrected absorbance is what would be observed if the volume were not changed from its initial value of 2.025Ml. Assuming that the reaction of semi orange with Pb2+has a 1 : 1stoichiometry, find the molarity of semi-xylenol orange in the original solution.

Nitrite ionNO-2, is a preservative for bacon and other foods, but it is potentially carcinogenic. A spectrophotometric determination ofNO-2makes use of the following reactions

Here is an abbreviated procedure for the

determination:

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

2. After 10min , 2.00mL of 1 鈥揳 minonaphthalene 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. 50.0mL of food extract suspected of containing nitrite; final absorbance \(=0.622\).

C. Same as B, but with 10.0渭Lof7.50脳10鈭�3MNaNO2added 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 ofNO-2were present in 50.0mL of food extract?

18-9 Why does a compound whose visible absorption maximum is at 480 nm (blue-green) appear to be red?

When I was a boy, Uncle Wilbur let me watch as he analyzed the iron content of runoff from his banana ranch. A 25.0 - mLsample was acidified with nitric acid and treated with excess KSCN to form a red complex. (KSCN itself iscolorless.) The solution was diluted to 100.0mLand put in a variable-pathlength cell. For comparison, a 10.0 - mLreference sample of6.80脳10-4MFe3+was treated with HNO3andand diluted to. The reference was placed in a cell with a 1.00 - mL light path. The runoff sample exhibited the same absorbance as the reference when the path length of the runoff cell was 2.48cm. What was the concentration of iron in Uncle Wilbur鈥檚 runoff?

What is the difference between fluorescence and phosphorescence?
See all solutions

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