The absorbances of solutions containing K 2 CrO 4 in 0.05 M KOH were measured in a 1.0-cm cell at…

The absorbances of solutions containing K2CrO4
in 0.05 M KOH were measured in a 1.0-cm cell at 375 nm. The following results
were obtained:

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Find the absorptivity of the chromate ion, CrO4-2
in L g-1 cm-1 and the molar absorptivity of chromate in L
mol -1 cm-1 at 375 nm.

The absorbances of solutions containing Cr as dichromate Cr2O72- in 1.0 M H2SO4 were measured at 440 nm in a
1.0-cm cell. The following results were obtained:

Find the absorptivity of dichromate (L g-1 cm-1)
and the molar absorptivity (L mol -1 cm-1) at 440 nm.

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