CHEM403 Lecture Notes - Lecture 9: Purified Water, Colorimetry, Transmittance
Document Summary
Fescn2+ stock solution deionized water (ml) final fescn2+ concentration (m) 0. 763: y = 4. 462x + 0. 2627, our r2 value was 0. 9949, meaning that our points were generally very close to the regression line. 0. 763 = 4. 467(x) + 0. 2627 x = 0. 111999 = 0. 112 m: this dilution would decrease the concentration of the final solution. The dilution factor is 2: the measured concentration of the diluted solution would need to be multiplied by 2 to determine the original solution, the dilution factor is 10. To calculate the concentration of the original unknown, the dilution concentration would be multiplied by 10: the dilution factor is 5/2. To determine the concentration of the original, one would multiply by 5/2. Absorbance is preferred to % transmittance because absorbance is more directly related to concentration of a solution. % transmittance has a logarithmic relationship: we chose the analytical wavelength to be 470 nanometers because when correlating to visible light, this color is blue/green.
