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Endothermic and Exothermic Reactions

Figure from experiment 1 from Chemistry with Vernier


Many chemical reactions give off energy. Chemical reactions that release energy are called exothermic reactions. Some chemical reactions absorb energy and are called endothermic reactions. You will study one exothermic and one endothermic reaction in this experiment.

In Part I, you will study the reaction between citric acid solution and baking soda. An equation for the reaction is:

{{\text{H}}_{\text{3}}}{{\text{C}}_{\text{6}}}{{\text{H}}_{\text{5}}}{{\text{O}}_{\text{7}}}{\text{(aq)  +  3 NaHC}}{{\text{O}}_{\text{3}}}{\text{(s)}} \to {\text{3 C}}{{\text{O}}_{\text{2}}}{\text{(g)  +  3 }}{{\text{H}}_{\text{2}}}{\text{O(1)  +  N}}{{\text{a}}_{\text{3}}}{{\text{C}}_{\text{6}}}{{\text{H}}_{\text{5}}}{{\text{O}}_{\text{7}}}{\text{(aq)}}

In Part II, you will study the reaction between magnesium metal and hydrochloric acid. An equation for this reaction is:

{\text{Mg(s)  +  2 HCl(aq)}} \to {{\text{H}}_{\text{2}}}{\text{(g)  +  MgC}}{{\text{l}}_{\text{2}}}{\text{(aq)}}


In this experiment, you will

  • Study one exothermic and one endothermic reaction.
  • Become familiar with using Logger Pro.
  • Collect and display data on a graph.

Sensors and Equipment

This experiment features the following Vernier sensors and equipment.

Option 1

Option 2

Additional Requirements

You may also need an interface and software for data collection. What do I need for data collection?

Standards Correlations

See all standards correlations for Chemistry with Vernier »

Experiment 1 from Chemistry with Vernier Lab Book

<em>Chemistry with Vernier</em> book cover

Included in the Lab Book

Vernier lab books include word-processing files of the student instructions, essential teacher information, suggested answers, sample data and graphs, and more.

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