Quantitative Analysis Worksheet

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4. Calculate the pAg for a solution containing 0.0598 M Ag(NH3)2+ that is also 0.25 M NH3. Ag+(aq) + e* = Ag(s) E° = +0.799 V Ag(NH3)2+(aq) + e* = Ag(s) + 2NH3(aq) E = +0.370 V 5. A sample containing caffeine (C3H10N402, 194.19 g/mol) was quantitatively transferred to a 250.00-ml volumetric flask, and the solution was diluted to volume with distilled water and thoroughly mixed. A 10.00-ml aliquot of the caffeine solution was accurately transferred to a 100.00-ml volumetric flask, diluted to volume, and thoroughly mixed. An absorbance of 0.653 was measured for the diluted caffeine solution at 275 nm in a 1-cm quartz cuvette. Calculate the mass of caffeine in the original sample. €275 nm (C8H10N402) = 9148 Mcm = 6. A mixture containing potassium dichromate (K2Cr2O7) and potassium permanganate (KMnO4) was spectrophotometrically analyzed in a 1.0-

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