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Question

Is this reaction a double displacement reaction? CH3COOH(aq)+NaHCO3(s)CH3COONa(aq)+CO2(g)+H2O(l)


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Solution

Double displacement reaction:

  • When two compounds react, positive ions (cation) and the negative ions (anion) of the two reactants switch places, forming two new compounds or products is known as a double displacement reaction.
  • A double replacement reaction is represented by the general equation, AB+CDAD+CB

Decomposition reaction:

  • A reaction in which one reactant breaks down into two or more products is known as a decomposition reaction.
  • This can be represented by the general equation is ABA+B.

The reaction between Acetic acid(CH3COOH) and Sodium bicarbonate NaHCO3:

  • Acetic acid(CH3COOH) reacts with Sodium bicarbonate NaHCO3 to form Sodium acetate (CH3COONa) and Carbonic acid (H2CO3)

CH3COOH(aq)Aceticacid+NaHCO3(s)SodiumbicarbonateCH3COONaSodiumacetate+H2CO3(aq)Carbonicacid.

  • This is a double displacement reaction because the Na is displaced with the H of CH3COOH.
  • The carbonic acid formed decomposes into CO2 and water

H2CO3(aq)CarbonicacidCO2(g)Carbondioxide+H2O(l)Water.

  • When two equations add together, the H2CO3 cancels out, that is

CH3COOH(aq)Aceticacid+NaHCO3(s)SodiumbicarbonateCH3COONa(aq)Sodiumacetate+CO2(g)Carbondioxide+H2O(l)Water

Therefore, the given reaction is a double displacement reaction.


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