Question

The following %T data were obtained for a 0.5M aqueous Cr3+ solution. ​ a. Calculate the absorbances that correspond to the %T values. Wavelength 650, 625, 600, 575, 550, 525   %T 23.1, 7.9, 4.0, 3.0, 7.1, 16.4.        A= ___,____,___,___,___,____

The Wavelength max for this Cr 3+ solution based on the above data is: _______nm

Answer 1

A= 2-log %T

ans A= ebC

So A is directly proportional to concentration.

hence given data on % Transmittance will be converted to Absorbance and the highest absorbance value will be located and the corresponding wave length will be the wave length at which maximum concentration of Cr+2 wil be there.

Wave length(nm)	%T	A
650	23.1	0.636388
625	7.9	1.102373
600	4	1.39794
575	3	1.522879
550	7.1	1.148742
525	16.4	0.785156

Absorance will be maximum at 575 nm.