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Chapter 18: Q3TY (page 440)

0.10mMKMnO4has an absorbance maximum of 0.26 at 525 nm in a

1.000-cm cell. Find the molarabsorptiveand the concentration of a solution whose

absorbance is 0.52 at 525 nm in the same cell.

Short Answer

Expert verified

The value of molar absorptive is2600M-1cm-1

The value of solution absorbance is0.2mM

Step by step solution

01

Calculate molar absorptive:

Equation to calculate 蔚 is,

蔚=Abc 鈫�(1)

Given,

c=0.10mMb=1.000cmA=0.26

Substitute in equation (1),

蔚=0.261.000cm0.10mM10-3M1mM蔚=2600M-1cm-1

The value of molar absorptive is 2600M-1cm-1

02

Calculate solution concentration:

Equation for concentration is c=Abc

Given,

b=1.000cmA=0.26蔚=2600M-1cm-1

Substitute in above equation,

c=0.521.000cm2600M-1cm-1=0.0002M103mM1Mc=0.2mM

The value of solution absorbance is0.2mM

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Most popular questions from this chapter

(a) How much energy (in kilojoules) is carried by one mole of photons of red light with位= 650 nm?

(b) How many kilojoules are carried by one mole of photons of violet light with位= 400 nm?

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?

A compound with molecular mass 292.16g/molwas dissolved in a 5 - mLvolumetric flask. A1.00 - mLaliquot was withdrawn, placed in a 10 - mLvolumetric flask, and diluted to the mark. The absorbance atwas in 0.427 i acuvet. The molar absorptivity at 340nm is蔚340=6130M-1cm-1

(a) Calculate the concentration of compound in the cuvet.

(b) What was the concentration of compound in the 5 - mL flask?

(c) How many milligrams of compound were used to make the 5 - mLsolution?

Preparing standards for a calibration curve.

(a) How much ferrous ethylene diammonium sulfate(FeH3NCH2CH2NH3SO42鈰�4H2O,FM382.15)should be dissolved in a 500mL volumetric flask with1MH2SO4to obtain a stock solution with~500渭gFe/mL2?

(b) When making stock solution (a), you actually weighed out 1.627 g of reagent. What is the Fe concentration in role="math" localid="1668357579931" 500渭gFe/mL2?

(c) How would you prepare 500 mL of standard containing 1,2,3,4, and5渭gFe/mL2in0.1MH2SO4infrom stock solution (b) using any Class A pipets from Table 2-4 with only 500 -mL volumetric flasks?

(d) To reduce the generation of chemical waste, describe how you could prepare 50 mL of standard containing, andinfrom stock solution (b) by serial dilution using any Class A pipets from Table 2-3 with only 50mL volumetric flasks?

Preparing standards for a calibration curve.

(a) How much ferrous ammonium sulfate(FeNH42SO42鈰�6H2OFM392.15)should be dissolved in a 500mL volumetric flask withto obtain a stock solution with1000渭gFe/mL?

(b) When making stock solution (a), you weighed out 3.627 g of reagent. What is the Fe concentration in?

(c) How would you prepare 250mL of standard containing containing ~1,2,3,4,5,6,7,8and10in0.1MH2SO4infrom stock solution (b) using only 5- and 10-mL Class A pipets, only 250mL volumetric flasks, and only two consecutive dilutions of the stock solution? For example, to prepare a solution with ~4渭gFe/mL,, you could first dilute 15mL(=10+5mL) of stock solution up to 250 mL mLto get~(1525)(1000渭gFFe/mL)=鈭�60渭gFe/mL Then dilute 15mL of the new solution up to 250 mL again to get~(15250)(60渭gFe/mL)=鈭�3.6渭gFe/mL
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