Use it as a demonstration or vary the amounts of citric acid and sodium bicarbonate to make an experiment.

Difficulty: Average

Time Required: Minutes

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.   The reaction is: H3C6H5O7(aq) + 3 NaHCO3(s) --> 3 CO2(g) + 3 H2O(l) + NaC6H5O7(aq)

4.   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 citric 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:

 

Hosted by www.Geocities.ws

1