A student prepared a series of solutions of copper (II) sulfate of known concentration and measure their absorbance at $600 n m$ is a colorimeter. A graph of the absorbance vs. concentration for these solutions is shown below.
The student then measured the absorbance of the unknown solution and found it to be $0.55$ .
What is the concentration of the unknown solution?

0.28 M

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0.55 M

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0.83 M

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1.1 M

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Solution

The correct option is A $0.28 M$
According to Beer's law of determining concentration;
Absorbance $= (e) (L) (C o n c e n t r a t i o n)$
$\Rightarrow (0.55) = (2) (C o n c e n t r a t i o n)$
Slope of graph $= 2$ , So, $e = L = 2$
$\Rightarrow C o n c e n t r a t i o n = 0.28 M$

Suggest Corrections

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