CHEM 111L Lecture Notes - Lecture 5: Sodium Borohydride, Diffraction Grating, Sodium Bromide

• School: College of Charleston
• Department: Chemistry and Biochemistry
• Course: CHEM 111L
• Professor: Guirgis

Document Summary

Measure the width of a human hair using a laser pointer and diffraction. Synthesize silver nanoparticles, and investigate how color is related to particle size. Separate light using diffraction grating a large number of tiny parallel groves (or lines) that reflect light waves in different direction depending on their wavelengths. Using a red light laser: wavelength = 632 nm. Tape hair vertically on end of laser pointer. Pipet the following in all 3 vials: Pipet different amounts of 1. 00x10 -5 m sodium bromide to each vial. Pipet 2500 ul of 5. 00x10 -3 m sodium borohydride to each vial. Take a picture of each solution for the lab report. Write color of each solution and identify the approximate wavelength of maximum absorbance for each. The color of the solution is the color reflected, so the solution absorbs the wavelength of the complimentary color. What should be in your lab notebook before you leave .