Evaluating the Equilibrium Constant for the Reaction of Iron(III) Ion with Thiocyanate Ion
Pre-Lab
You will complete this pre-lab exercise instead of the one in your laboratory manual.
Consult your laboratory manual and the course web site for assistance.
1.) What is meant by absorbance?
2.) What is Beer's Law?
3.) What must you vary in order to obtain a Beer's Law plot?
4.) What must you measure in order to obtain a Beer's Law plot?
5.) To make a Beer's Law plot, what will you plot?
6.) In what units is concentration expressed in Beer's Law?
7.).If you start with a small glass of vodka that has an ethanol concentration of 0.2M and mix it with three small glasses of orange juice, what is the ethanol concentration of the cocktail that results? (Assume you do all of your measurements with the same glass.)
8.) If you take 2mLs of a solution that is 4M acetic acid and add enough water to it to make 10mLs, what is the molarity of the final solution?
9.) When a chemical reaction is at equilibrium, the rate of the forward reaction is equal to the rate of the reverse reaction. True or False?
10.) When a chemical reaction is at equilibrium, all reactions have stopped. True or False?
11.) When a chemical reaction is at equilibrium, the concentrations of the reactants are equal to the concentrations of the products. True or False?
12.) When a chemical reaction is at equilibrium, the concentrations of the reactants and products are not changing. True or False?
13.) For the equilibrium: A + 2B -> 3C, what is the equilibrium expression?
14.) If the initial concentration of A is 1.0 M and the initial concentration B is 1.0 M, the concentration of A at equilibrium is 0.8 M. What is the equilibrium constant for this reaction?
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Last updated: 09-January-02 / lav