Chemistry lab 16 -prelab

Chemistry lab 16 -prelab - Pre Lab #16: Spectrophotometric...

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Pre Lab #16: Spectrophotometric Determination of an Equilibrium Constant Preparing the standard solutions 1. Put on your safety glasses. 2. Dispense the amount of HSCN shown in the table from the dispensing buret into a 100 mL volumetric flask and dilute to the mark with 0.200 M Fe(NO3)3 in 0.500 M HNO3 solution (not 0.002 M!) (see TECH Section II.G). 3. Remember to n ever put acetone into a cuvet as it will “cloud” the plastic. 4. Review how to use the spectrophotometer in TECH Section V. You must use the same spec for all absorbance readings. 5. Set the wavelength of the spec to 447 nm. 6. “Zero” the spec using the 0.200 M Fe(NO3)3 in 0.500 M HNO3 solution as a blank, and determine the absorbance of your assigned standard solution. 7. Use the standard solutions prepared by other groups to obtain absorbance measurements for all of the standard solutions using your group’s spec. Preparing the equilibrium solutions 1. Label three clean, dry 18 x 150 mm test tubes as "2", "3" and "5". 2. Obtain about 35 mL of 0.00200 M Fe(NO3)3 in 0.500 M HNO3 solution (not 0.200 M!) in a clean, dry 250 mL beaker. 3.
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This note was uploaded on 02/25/2012 for the course CHEM 4385 taught by Professor Staff during the Fall '11 term at Texas State.

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Chemistry lab 16 -prelab - Pre Lab #16: Spectrophotometric...

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