AB + CD AC + BDwhere A, B, C, and D are atoms or ions. The reaction between vinegar and baking soda can be written as a double displacement reaction if carbonic acid (H2CO3) is considered a product:
HC2H3O2(aq) + NaHCO3(aq) NaC2H3O2(aq) + H2CO3(aq)Here A, B, C, and D are H+, C2H3O2-, Na+, and HCO3-, respectively. [1, 2]
However, carbonic acid readily decomposes into carbon dioxide and water,
H2CO3(aq) CO2(aq) + H2O()and the carbon dioxide can escape from the solution as a gas.
The combined equation is
HC2H3O2(aq) + NaHCO3(aq) NaC2H3O2(aq) + H2O() + CO2(g)which doesn't fit neatly into one category, since it is a double displacement followed by a decomposition. When you encounter a reaction that is difficult to classify, consider the possibility that it may be the net or total equation for a sequence of steps.
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Last Revised 08/17/15.URL: http://antoine.frostburg.edu/chem/senese/101/reactions/faq/print-classify-vinegar-bakingsoda.shtml