If a 0.280 mM solution of MnO 4 1- has an absorbance of 0.420 at 525 nm in a 1.0

ID: 786232 • Letter: I

Question

If a 0.280 mM solution of MnO41- has an absorbance of 0.420 at 525 nm in a 1.000 cm cell. What is the concentration of a MnO41- solution that has absorbance of 0.690 in the same cell at that wavelength?

[MnO41- ] = mM

Explanation / Answer

A = el C , el = const ,

hence A2/A1 = C2/C1

0.69/0.42 = C2/0.28

C2 = 0.46 mM

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If a 0.280 mM solution of MnO 4 1- has an absorbance of 0.420 at 525 nm in a 1.0

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