If a solution absorbed yellow light, what color would the solution appear to be?

Question

If a solution absorbed yellow light, what color would the solution appear to be? Calculate the concentration of a solution obtained when 15.00 mL of 1.92 times 10^-3 M KMnO_4 is measured from a buret into a 50 0 mL volumetric flask which is then filled to the 50.0 mL graduation mark with distilled water. A graph of absorbance vs. concentration yields a linear standard curve for a set of standard solutions. Use the GRAPHICAL ANALYSIS program to plot the following absorbance (y) vs. concentration (x) data: what is the slope of this graph? Suppose that an unknown sample is analyzed spectrophotometrically (at the same wavelength as that used for the standard curve measurements) and the absorbance was found to be 0.194. Use the standard curve to determine the concentration of the unknown.

Explanation / Answer

If Solution asorbs yellow light it appears as Violet colour.

(1)

M1 V1 = M2 V2

0.00192 * 15.00 = M2 * 50.00

M2 = 0.000576 M = 5.76 * 10-4 M

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