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Complex formation by 3-aminopyridine and picric acid in chloroform solution gives a
Chapter 18, Problem 18-D(choose chapter or problem)
Complex formation by 3-aminopyridine and picric acid in chloroform solution gives a yellow product with an absorbance maximum at 400 nm. Neither starting material absorbs significantly at this wavelength. Stock solutions containing 1.00 104 M of each compound were mixed as indicated, and the absorbances of the mixtures were recorded. Prepare a graph of absorbance versus mole fraction of 3-aminopyridine and find the stoichiometry of the complex. Picric acid (mL) 3-Aminopyridine (mL) Absorbance at 400 nm 2.70 0.30 0.106 2.40 0.60 0.214 2.10 0.90 0.311 1.80 1.20 0.402 1.50 1.50 0.442 1.20 1.80 0.404 0.90 2.10 0.318 0.60 2.40 0.222 0.30 2.70 0.110
Questions & Answers
QUESTION:
Complex formation by 3-aminopyridine and picric acid in chloroform solution gives a yellow product with an absorbance maximum at 400 nm. Neither starting material absorbs significantly at this wavelength. Stock solutions containing 1.00 104 M of each compound were mixed as indicated, and the absorbances of the mixtures were recorded. Prepare a graph of absorbance versus mole fraction of 3-aminopyridine and find the stoichiometry of the complex. Picric acid (mL) 3-Aminopyridine (mL) Absorbance at 400 nm 2.70 0.30 0.106 2.40 0.60 0.214 2.10 0.90 0.311 1.80 1.20 0.402 1.50 1.50 0.442 1.20 1.80 0.404 0.90 2.10 0.318 0.60 2.40 0.222 0.30 2.70 0.110
ANSWER:Step 1 of 3
Complex formation by 3-aminopyridine and picric acid in chloroform solution gives a yellow product with an absorbance maximum at 400 nm.
Stock solutions containing 
Since the initial concentrations of both the reacting species are same, thus the number of moles of each species should be directly proportional to its volume.