Question 2. Experiment: Spectrophotometric determination of Mn and Crin a mixture a. The slopes of the calibration curves (L.mg".qm) for Mn and Cr in a sample were measured with pure samples (standards) using a Spectronic-20 in a l-cm cell are given in the following table. Cr Mn Slope, 40 nm 16400 13870 Slope, 545 3990 6420 A mixture (unknown sample) of Cr and Mn in cm cell had an absorbance of 0.957 at 440- and 0.559 at 545-nm. Find the concentrations of Mn.end Cr in the unknown sample. A uno EBC+Ebcmnnuu

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Question 2. Experiment: Spectrophotometric determination of Mn and Cr in a mixture
a. The slopes of the calibration curves (L.mg".gm") for Mn and Cr in a sample were measured with pure
samples (standards) using a Spectronic-20 in a l-cm cell are given in the following table.
Cr
Mn
Slope, 460 nm
-/16400
13870
Slope, 545
3990
6420
A mixture (unknown sample) of Cr and Mn in -cm cell had an absorbance of 0.957 at 440-
and 0.559 at 545-nm. Find the concentrations of Mn.end Cr in the unknown sample.
A wuo
EBC +b<mnnuu
us
Transcribed Image Text:Question 2. Experiment: Spectrophotometric determination of Mn and Cr in a mixture a. The slopes of the calibration curves (L.mg".gm") for Mn and Cr in a sample were measured with pure samples (standards) using a Spectronic-20 in a l-cm cell are given in the following table. Cr Mn Slope, 460 nm -/16400 13870 Slope, 545 3990 6420 A mixture (unknown sample) of Cr and Mn in -cm cell had an absorbance of 0.957 at 440- and 0.559 at 545-nm. Find the concentrations of Mn.end Cr in the unknown sample. A wuo EBC +b<mnnuu us
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