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Question

What is the concentration of a cobalt (II) nitrate solution whose absorbance was measured at 0.55 in a 1.1 cm cuvette with a molar extinction coefficient of 1.5/M cm?

A
0.30 M
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B
0.60 M
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C
0.90 M
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D
1.2 M
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Solution

The correct option is A 0.30 M
According to Beer's law of determining connection.
Absorbance =eLC
Given, e=1.5 /cmM;L=1.1 cm
Absorbance =0.55
0.55=(1.5)(1.1)C
C=0.33M

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