Equilibrium and Le Chatelier's Principle - Prelab 9 | CHEM 105, Lab Reports of Chemistry

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Name _______________

Lab section: M T W Th F

Reading Assignment:

 Theory of experiment—see lab manual.

 Equilibrium and Le Chatelier’s Principle—Zumdahl, Chapter 6.

Questions:

1) In the space available, define the following terms in your own words :

a. Le Chatelier's Principle ___________________________________________

_____________________________________________________________

b. Beer's Law (see Vitamin Pill lab) _____________________________________

_____________________________________________________________

2) Review the procedure for Part I where two reactants will be added as

outlined in the data table below.

a. Fill in the shaded cells in the table below. The concentrations that you will fill in refer to the

concentration immediately after the reactants are mixed but before any reaction occurs to bring the system to

equilibrium. Using the stock solution concentrations and the amounts of each reactant, calculate the initial

concentration of the reactants. Then calculate the molar ratio.

Solutio n Stock solution: 0.2M Fe3+ in 0.5 HNO 3 Stock solution: 0.002M SCN- in 0.5 HNO 3 Fe3+ Vol. (mL) Fe3+ Conc. (M)*

SCN-

Vol. (mL)

SCN-

Conc. (M) Water Vol. (mL)*

TOTAL

Vol. (mL ) Molar Ratio of Fe3+^ to SCN- 1 1.00 5.00 44 50.

• This is the concentration immediately after the reactants are mixed but before any reaction occurs to bring the system to equilibrium