chemical eq.

Asked by  | 13th Jun, 2009, 01:17: PM

Expert Answer:

Baking soda, a pure chemical called sodium bicarbonate, has the chemical formula:


When dissolved in water baking soda separates into sodium (Na+) and bicarbonate ions (HCO3- ):

NaHCO3 ---> Na+(aq) + HCO3-(aq)

Vinegar, a weak (5%) solution of acetic acid in water, partially dissociates into hydrogen ( H+) and acetate ions (CH3COO-):

CH3COOH <--> H+(aq) + CH3COO-(aq)

The reaction between baking soda and vinegar is actually two reactions, an acid base reaction followed by a decomposition reaction.

When the two ingredients are mixed, hydrogen ions ( H+) from the vinegar react with the bicarbonate ions (HCO3- ) from the baking soda to form a new chemical called carbonic acid (H2CO3).

H+ + HCO3- ---> H2CO3

The carbonic acid thus formed then immediately decomposes into carbon dioxide gas (CO2)and water (H2O).

H2CO3 ---> H2O + CO2

It's this carbon dioxide gas that you see bubbling and foaming as soon as you mix baking soda and vinegar together.

Using the molecular structures of only the components involved, the chemical reaction can be written:

The overall reaction however, is often written as follows:

NaHCO3 (aq) + CH3COOH (aq) ----> CO2 (g) + H2O (l) + CH3COONa (aq)

Answered by  | 13th Jun, 2009, 02:13: PM

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