# Exam

Topics: PH, Titration, Chemistry Pages: 2 (1112 words) Published: October 29, 2014
Safety What must you wear at all times while in the lab (Clothing, protective gear, etc) Must wear Where are the safety showers and eyewash stations located Where is the first aid kit and fire extinguisher located If you spill a chemical on yourself whether it is on your hands, on your clothes or in your eyes, what do you do and for how long do you do it Laboratory Techniques If you have four types of glassware, a 100 mL volumetric flask, a 10 mL volumetric pipet, a 10 mL graduated pipet, and a 1 mL volumetric pipet, how do you make a 1 to 10 dilution from the stock solution. What is a serial dilution What is a parallel dilution Where is the filtered product from the Indigo Lab disposed Where do you dispose of plastic transfer pipets that have been contaminated with chemicals Beers Law Write the formula for Beers Law and define each of the variables How does the molar absorptivity depend upon the concentration (mol/L) of the dissolved solute It increases in a linear fashion as concentration increases. It decreases in a linear fashion as concentration increases. It is independent of concentration It increases in an exponential fashion as concentration increases. None of the above The stock solution of Allura Red provided by the prep room is 4.0 x 10-3 M. A solution that produces an absorbance at the wavelength of maximal absorbance has a concentration of 4.0 x 10-5. To prepare a solution having an absorbance of 1.0 at the wavelength of maximal absorbance would require diluting 1.00 mL of the stock solution to _________ mL with distilled water. If the absorbance of a given dye with a concentration of 1.05x 10-5 was 0.549, for example Allura Red, which has a wavelength of 508.43, what would the molar absorptivity be Path length is 1 cm. If the experimental value for the molar absorptivity that was determined was 6.7 x 104 (abs)(mol-1)(cm-1), and the theoretical value was 7.6 x 104 (abs)(mol-1)(cm-1), what is the percent relative deviation Dye Kinetics Consider...