Why does the temperature of the mixture change?
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
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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