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When calcium carbonate and hydrochloric acid react, bubbles form. how do you know a reaction occurred? a gas was formed a precipitate was formed a color change happened the volume changed?

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Markinzy
The reason that you can tell that it was chemical is because you can see the bubbles forming. This means that it is giving off a gas.

Answer: The indicator that indicates the reaction has occurred is the formation of gas.

Explanation:

The common indicators of a chemical change has occurred are:

  • Release of gas from the reaction.
  • Formation of bubbles.
  • Color change
  • Temperature change
  • Formation of a precipitate
  • Specific odor

The chemical equation for the reaction of calcium carbonate and hydrochloric acid follows:

[tex]CaCO_3(s)+2HCl(aq.)\rightarrow CaCl_2(s)+H_2O(l)+CO_2(g)[/tex]

As, we can see, gas (carbon dioxide) is being released during the reaction with effervescence.

Hence, the indicator that indicates the reaction has occurred is the formation of gas.

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