Assignment:
Q1. A weak organic acid in its dissociated form (A-) absorbs at 375 nm with a molar absorptivity, ε, of 4.48×103 L/(molcm). The non-dissociated form of the acid (HA) does not absorb at 375 nm. At 375 nm, a 3.0×10-3 M solution of the acid in water has an absorbance of 0.462 in a 1.00 cm cell.
a. What is the concentration of A- in this solution?
b. What is Ka for this acid?
Q2. The molar absorptivity for the complex formed between bismuth (III) and thiourea is 9.32 x 103 L mol-1 cm-1 at 470 nm. Calculate the range pf permissible concentrations for this complex if the percent transmittance is to be greater than 15.0 % and less than 85.0 % in a 2.00-cm cell.
Provide complete and step by step solution for the question and show calculations and use formulas.