How+To+Create+an+Endothermic+Chemical+Reaction

= How To Create an Endothermic Chemical Reaction (Safe) = Most endothermic reactions contain toxic chemicals, but this reaction is safe and easy. Use it as a demonstration or vary the amounts of citric acid and sodium bicarbonate to make an experiment. **Here's How:**  1. Pour the citric acid solution in a Styrofoam coffee cup. Use a thermometer or other temperature probe to record the initial temperature.  2. Stir in the baking soda (sodium bicarbonate). Track the change in temperature as a function of time.  3. When you have completed your demonstration or experiment, simply wash the cup out in a sink. No toxic chemicals to mess with! **Tips:**  1. Feel free to vary the concentration of the acetic acid solution or the quantity of sodium bicarbonate.  2. An endothermic is a reaction that requires energy to proceed. The intake of energy may be observed as a decrease in temperature as the reaction proceeds. Once the reaction is complete, the temperature of the mixture will return to room temperature. **What You Need:**  ·  25 ml citric acid sol  ·  15 g baking soda  ·  Styrofoam cup  ·  thermometer  ·  stirring rod