Endothermic reaction science experiment | Fizzics Education

Endothermic reaction

Endothermic reaction

Follow FizzicsEd 150 Science Experiments:

You will need:

Foam cup


A quarter cup of vinegar

1 table spoon of bicarbonate soda.

Materials needed for the endothermic reaction experiment showing vinegar, bicarbonate soda, a thermometer, a cup and a spoon
1 Endothermic reaction experiment - pouring vinegar

Pour vinegar into the foam cup and measure its temperature with the thermometer and record this.


Add the bicarbonate soda gradually to avoid overflowing foam and stirring with the thermometer.

3 Endothermic reaction experiment - recording temperature

Record the lowest temperature when the reading on the thermometer stops dropping.

Why Does This Happen:

Did the temperature increase, decrease, or stay the same? What else did you notice about the reaction? The reaction between vinegar and bicarbonate soda can be written as:

Vinegar + Bicarbonate Soda —> Carbon Dioxide + Water + Sodium Acetate

This is an endothermic reaction, which means the mixture requires and takes heat from its surroundings in order to react. This results in a drop in temperature of the contents of the cup.

As an extension for high school chemistry, you can use this experiment to demonstrate how to calculate the change in enthalpy for a reaction:

ΔH = change in enthalpy (kJ),
c = specific heat capacity of water (4.18 kJ kg-1 °C-1),
m = mass of solution (kg),
ΔT = change in temperature of the solution (°C).
For other bicarbonate soda and vinegar experiments, check out this list in our blog!

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