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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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