CHEM 2001 : Exam 1 Garno 2013 Answer Key Final
Document Summary
Name ______________________________ (print clearly: (10 points) you have been sent for fieldwork to investigate the occurrence of iron in river samples. As part of your investigation, you must make field measurements of traces of iron in groundwater samples using a uv/vis spectrophotometer. A 3. 15 10-6 m solution of the colored iron complex exhibited an absorbance of 0. 267 at 410 nm in a 1. 000 cm cuvette. A blank solution made from distilled water had an absorbance that measured 0. 000. (a) find the molar absorptivity of the colored complex. (b) the absorbance of an unknown solution prepared from groundwater was 0. 228. A = b c = a / b c b = path length = 1 cm: molar absorptivity = = a / b c = 0. 267 / (1. 000 cm 3. 15 10-6 m) = September 26, 2013: (5 points) nancy diluted her samples by adding 1. 00 ml of each sample to 49. 0 ml of water.
