32 - 1AP Chemistry Lab Chemical Formulas Brockport High...

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1 AP Chemistry Lab Brockport High School NY USA Chemical Formulas Mr Keefer Objective: To become familiar with chemical formulas and how they are obtained, and determine the percent composition of a product. Apparatus : balance, Bunsen burner, crucible and cover, ring stand and ring, clay triangle, goggles, test tube, 250 mL and 50 mL beakers, eye dropper Chemicals : powdered sulfur (S), copper (Cu) wire or turnings Introduction The first step in deriving the empirical and molecular formula for a compound is the determination of its percent composition. This may be done experimentally by a synthesis reaction. Procedures A. The formula of a sulfide of copper by synthesis 1. Support a clean crucible and cover on a triangle and dry it by heating to a dull red over the Bunsen burner. Allow the crucible and cover to cool for 5-10 minutes. 2. Mass the crucible and cover to the nearest 0.001 g. 3. Place 1.5 - 2.0 grams of tightly wound copper wire or copper turnings in the crucible and mass together with the cover. 4.
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