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The law of conservation of mass states that:
In a chemical reaction, mass is neither created nor destroyed.
Instead:
We can change how atoms are bonded, but we do not create or destroy atoms in ordinary chemical reactions.
Antoine Lavoisier first clearly demonstrated this principle in the late 18th century by carefully weighing reactants and products.
We can test this law in the lab by weighing substances before and after a reaction.
Neutralisation in a closed container
To show conservation of mass clearly, it’s best to carry out the reaction in a closed container (for example, a conical flask with a bung) so that no gas can escape and nothing can enter.
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