Experiment 11 Determination of Solution Concentration via Visible Spectrophotome

Question

Experiment 11 Determination of Solution Concentration via Visible Spectrophotometry Questions and Problems (May be assigned before or after the experiment, depending on your instructor.) (Show all calculations where appropriate.) 1. Convert 370 nm to: a) meters (m) b) centimeters (em) c) millimeters (mm) 2. You have two solutions of the same compound that are blue. One is very pale and the other is very intense Absorbance of each solution was measured with a spectrophotometer at the same wavelength at which the solution absorbs. a) Which solution has the higher absorbance? b) Which is the more concentrated solution? 3. You have two solutions containing the same compound having the same pink color. The concentration of the first solution is 1.0 M, while the concentration of the other solution is 3.0 M. Absorbance of each solution was measured with the same spectrophotometer at the same wavelength. a) Which solution has the more intense pink color? b) Which solution has the higher absorbance?

Explanation / Answer

ans 1

370nm = 370 x 10-9 m = 3.7 x 10-7 m

370nm = 370 x 10-7 cm = 3.7 x 10-5 cm

370nm = 370 x 10-6 mm = 3.7 x 10-4 mm

ans 2

a) solution with intense color has higher absorbance

b) Since Absorbance is directly proportional to concentration .Therefore , solution with intense color has higher concentration

ans 3

a)Since Absorbance is directly proportional to concentration .Therefore,3 M solution has more intense pink color.

b)Since Absorbance is directly proportional to concentration .Therefore , 3 M solution has higher absorbance.

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