2.3. Absorption coefficient of Permanganate at 545 nm KMnO4- solution 1 KMnO4- solution 2 c = c = A = A = = = = ε ε ε(average) 2.4. Absorption coefficient of Permanganate at 427 nm KMnO4- solution 1 KMnO4- solution 2 c = c = A = A = = = = ε ε ε(average) Show the calculations of the concentration and the absorption coefficient using one example: d) Measurement of the absorbance of the sample For measuring the absorbance of your sample hand the test tube 16x160 (labeled with and your „PNo“ place number) to the lab assistant. He will fill in your sample. Immediately measure the absorbances at 427 nm and 545 nm against water. For tasks b), c) and d) you have at your disposal: 2 5/10 mL graduated pipettes 1 standard solution of K2Cr2O7 (≈1-3·10-3 M) 1 beaker for waste 1 standard solution of KMnO4 (≈1-5·10-4 M) 1 pipette bulb 8 plastic cuvettes (d = 1,0 cm) 4 test tubes 16×160 1 bottle of deionised water 1 kitchen towel empty test tube 16×160 labelled for „PNo“ 1 1 pen for labeling glass gathering your sample 2.5. Concentrations of KMnO4 and K2Cr2O7 in the sample A427 (sample) = A545 (sample) =
2.3. Absorption coefficient of Permanganate at 545 nm KMnO4- solution 1 KMnO4- solution 2 c = c = A = A = ε = ε = ε(average) = 2.4. Absorption coefficient of Permanganate at 427 nm KMnO4- solution 1 KMnO4- solution 2 c = c = A = A = ε = ε = ε(average) = Show the calculations of the concentration and the absorption coefficient using one example: d) Measurement of the absorbance of the sample For measuring the absorbance of your sample hand the test tube 16x160 (labeled with „PNo“ and your place number) to the lab assistant. He will fill in your sample. Immediately measure the absorbances at 427 nm and 545 nm against water. For tasks b), c) and d) you have at your disposal: 2 5/10 mL graduated pipettes 1 standard solution of K2Cr2O7 (≈1-3·10-3 M) 1 beaker for waste 1 standard solution of KMnO4 (≈1-5·10-4 M) 1 pipette bulb 8 plastic cuvettes (d = 1,0 cm) 4 test tubes 16×160 1 bottle of deionised water 1 kitchen towel 1 empty test tube 16×160 labelled „PNo“ for gathering your sample 1 pen for labeling glass 2.5. Concentrations of KMnO4 and K2Cr2O7 in the sample A427 (sample) = A545 (sample) =