The measured absorbance of a KMnO_4 solution was 0.856 for lambda = 530 nm. For

Question

The measured absorbance of a KMnO_4 solution was 0.856 for lambda = 530 nm. For the equation A = abc, the a and b constants were determined to be: a = 1750 L/(mol-cm) and b = 1.0 cm. What is the molarity of the KMnO_4 solution? If the solution from the previous example was a diluted KMnO_4 solution, made by diluting 20.0 ml of of a stock solution to a final volume of 250.0 ml, what of KMnO_4 in the stock (original) solution? Standard KMNO_4 solutions were prepared and their absorbances were measured. A plot of the absorbance versus concentration yields the following best fit line equation: y = 2881x + 0.00675. If the absorbance of an unknown KMNO_4 solution is measured to be 0.497, what is the molarity of KMNO_4 in the solution?

Explanation / Answer

3. concerntration of KMnO4 where C is the concerntration of KMnO4 , A is the absorbance

C = A - intercept / slope

given that y= 2881x + 0.00675

comparing with y=mx+c we get slope = 2881 and intercept =  0.00675

putting value in above formula

C = A - intercept / slope = 0.497 -  0.00675/  2881= 1.6 *10-4 g/lit

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