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Your Safer Source for Science
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Item #: PF2007 

Price: $30.00

In this lab experience, students experiment to determine whether reactions are endothermic or exothermic based on their color change at hot and cold temperatures. Students will come to the understanding that some reactions are reliant on temperature to shift their equilibrium. Often the focus is on solution concentration and students forget the role that temperature and pressure play. The cobalt chloride solution is endothermic and the iron thiocyanate solution is exothermic. The equilibrium for both is reversible. The industrial production of ammonia is exothermic. Students will see that for ammonia production thermal equilibrium is just one piece. It is actually a complex equilibrium that relies on concentration, pressure and temperature working together. This will help students appreciate the broader concept of equilibrium.

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Product Details

Safety: Before conducting the lab, review with the class the safety precautions on the student page. Then discuss any safety precautions that are specific to your science laboratory or classroom.

Materials Included in Kit

Cobalt(II) chloride/alcohol/water solution, 300 mL
Iron(III) nitrate solution, 0.1 M, 25 mL
Potassium thiocyanate solution, 0.1 M, 20 mL

Test tubes, 13 mm x 100 mm, 65

Additional Materials Required
Beakers, Borosilicate Glass, 50-mL, 10
Beakers, Borosilicate Glass, 150-mL, 20
DLAB Classic Magnetic Stirrer/Hot Plate, 10
Flinn Digital Thermometer, 20
Stirring Rods, Glass, 10