100106 Chemical Reactions Lab

100106 Chemical Reactions Lab - 7 Chemical Reactions CH 141...

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7 Chemical Reactions CH 141 Laura Dunn 10/3/06 Section 101
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Purpose : To investigate real-life synthesis, double, and single replacement reactions in the lab in a descriptive and quantitative point of view. Procedure : 1. Synthesis of ferrous chloride hexahydrate (FeCl 2 x 6H 2 O) Obtain a piece of “tin” can, really tin coated steel approximately 4.5 cm square. In order to remove the plastic and any paint that may be coating the steel, heat the piece of steel in a Bunsen burner flame until all the organic material has burnt off. Use crucible tongs! Work in the hood! Alternately heating the piece of metal and plunging into cold water may help in dislodging the char that forms on the steel. When as much of the char as practicable has been removed, dry your sample and weigh to the nearest .01 g. While you are waiting for your sample to dry, calculate how much 12M HCl is required to prepare 100 ml of 7M HCl. Check your calculation with your instructor. With your instructor’s approval, prepare the 100 ml of dilute HCl by adding the calculated amount of concentrated HCl to enough distilled water to make a final volume of 100 ml Hydrochloric acid is corrosive—wear “rubber gloves” and safety glasses. You will now dissolve your steel sample in hot dilute hydrochloric acid (7M HCl). Label a 150 ml beaker, cut your sample in small strips, place them in the beaker along with 40 ml of dilute acid and place on a hot plate in the hood. The acid should get hot but not boil vigorously. Do not permit the solution to boil to dryness (to prevent the formation of unwanted oxides). Should the volume of the solution drop below 20 ml, replenish the solution with more of your 7M HCl. As it may take some time for the steel to dissolve, start Part 2 or 3 of this experiment while you continue to monitor the progress of your
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100106 Chemical Reactions Lab - 7 Chemical Reactions CH 141...

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