Question

The absorbance of a 0.18 M colored solution was measured with red light and found to be 0.281. If the same curvette was cleaned, used, and dried what would you predict the absorbance to be for each of the following solution concentration?

a. 0.27 M solution

b. 0.36 M solution

c. 0.90 M solution

Answer 1

We know according to Beer-Lambert law, absorbance A = CL

From given values: 0.281=   0.18 L

=> --------------------(1)

Now solving equation A= for

(a) 0.27 M:    A= 0.27

Substituting value of from above equation (1)

A= 0.2810.27/0.18 = 0.421

Now solving equation A= for

(b) 0.36 M: A= 0.36

Substituting value of from above equation (1)

A= 0.2810.36/0.18 = 0.562

Again solving equation A= for

(b) 0.90 M: A= 0.90

Substituting value of from above equation (1)

A= 0.2810.90/0.18 = 1.405