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Molarity

What is the c...

Question

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

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 $= e L C$
Given, $e = 1.5 / c m - M; L = 1.1 c m$
Absorbance $= 0.55$
$\Rightarrow 0.55 = (1.5) (1.1) C$
$\Rightarrow C = 0.33 M$

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