If the absorbance of a potassium permanganate solution was 0.6 in a pathlength of 1cm, what would be the expected absorbance at a pathlength of 2cm?Selected Answer: [None Given]Answers: A. 0.2B. 0.3C. 1.2D. 0.8E. 0.4
Question
If the absorbance of a potassium permanganate solution was 0.6 in a pathlength of 1cm, what would be the expected absorbance at a pathlength of 2cm?Selected Answer: [None Given]Answers: A. 0.2B. 0.3C. 1.2D. 0.8E. 0.4
Solution
The absorbance (A) of a solution is given by the Beer-Lambert law: A = εlc, where ε is the molar absorptivity, l is the path length, and c is the concentration.
In this case, we are given that A = 0.6 when l = 1 cm. We are asked to find the absorbance when l = 2 cm.
According to the Beer-Lambert law, if we double the path length (l), we should also double the absorbance (A), assuming that the molar absorptivity (ε) and the concentration (c) remain constant.
Therefore, the expected absorbance at a path length of 2 cm would be 0.6 * 2 = 1.2.
So, the correct answer is C. 1.2.
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