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Chemistry question - why isn't this exothermic?

Discussion in 'Science' started by gumgamble, Jan 11, 2017.

  1. gumgamble

    gumgamble New commenter

    In the reaction between citric acid and baking soda, why does the temperature decrease and demonstrate an endothermic reaction? I thought that an acid and a base produces an exothermic reaction?

    Thanks!
     
  2. phlogiston

    phlogiston Star commenter

    It's not just an acid and a base.
    It's the decomposition of the hydrogen carbonate ion to produce water and carbon dioxide. This involves stronger bonds being broken than formed therefore endothermic. The reaction happens because there is a significant increase in entropy.
     
    wanet and gumgamble like this.
  3. gumgamble

    gumgamble New commenter

    Thanks!
     

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