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A salt X is formed and a gas is evolved when ethanoic acid reacts with sodium hydrogen carbonate. Name the salt X and the gas evolved. Describe an activity and draw the diagram of the apparatus to prove that the evolved gas is the one which you have named. Also, write a chemical equation of the reaction involved.


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Solution

Chemical reaction

  • Chemical reactions, in which reactants combine to form products, are represented by chemical equations.
  • Stoichiometric coefficients are added to the reactants and products to balance chemical equations.
  • It's significant because the principles of mass conservation and constant proportions require a chemical equation to be applied.

Ethanoic acid reacts with sodium hydrogen carbonate

  • When ethanoic acid reacts CH3COOH with sodium hydrogen carbonate NaHCO3, a salt X is formed and gas is produced.
  • The reaction is as follows:

CH3COOH+NaHCO3CH3COONa+H2O+CO2

  • When sodium hydrogen carbonate and ethanoic acid react, sodium ethanoate CH3COONa and carbon dioxide CO2 gas are produced.
  • Hence, X salt is Sodium ethanoate and gas is carbon dioxide.

Activity

  • In a test tube, add 2mL of diluted ethanoic acid and a spoonful of sodium hydrogen carbonate.
  • In a test tube, brisk effervescence occurs.
  • Pass the produced gas into lime water.
  • The evolution of carbon dioxide is confirmed when lime water turns milky.

Diagram of the apparatus


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