What is the concentration of KMnO4 in the stock solution? The absorption coeffic

Question

What is the concentration of KMnO4 in the stock solution? The absorption coefficient at a wavelength of 525 nm is 331,339 l/mole/cm. You are given ‘a’ which is 331,339 l/mol/cm and you have the absorbance reading at 525nm in your data tables. Calculate C using A=aC.

Also, keep dilution factor in mind and multiply by the denominator of your dilution to get your final answer (e.g. Dilution factor 1/40, multiply by 40).

Data for Absorbance Spectrum of KMnO4 Absorbance Dilution Factor -1/50 Wavelength 400 410 420 430 440 450 460 470 480 490 500 510 520 525 530 540 550 560 570 580 590 600 0.035 0.044 0.086 0.096 0.169 0.21 0.311 0.402 0.561 0.572 0.741 0.78 0.851 0.928 0.871 0.793 0.625 0.423 0.326 0.17 0.099 0.078

Explanation / Answer

At 525nm, A = 0.928

A = acl

C = 0.928 / 331339
= 2.8 X 10^-6
Dilution factor 10^4

So, 2.8 X 10^-6 X 10^4
    2.8 X 10^-2
    28 mM.

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