What happens when you mix
citric acid and sodium bicarbonate?

Maya Singleton & Alyssia Cox

Graph of Experiment

When citric acid and sodium bicarbonate were mixed the temperature decreased. This was and endothermic reaction because energy was absorbed. The lowest temperature was 15.1 degrees Celsius and the highest was 25.9 degrees Celsius.

Breakdown of the Reaction

C6H8O7 + 3NaHCO3 →3Na+C6H5O7 + 2H20 + 3CO2 - Balanced chemical equation

citric acid- a white, crystalline, water-soluble powder, a tribasic acid having a strong acidic taste, an intermediate in the metabolism of carbohydrates occurring in many fruits, especially limes and lemons, obtained chiefly by fermentation of crude sugar or corn sugar

sodium bicarbonate- a white, crystalline, water-soluble solid, in powder or granules, usually prepared by the reaction of soda ash with carbon dioxide or obtained from the intermediate product of the Solvay process by purification

In this reaction, citric acid is mixed with sodium bicarbonate and makes sodium, water, carbon dioxide, and trisodium citrate. The reactants are citric acid and baking soda and the products are sodium, citrate, water, and carbon dioxide. The Law of Conservation of Mass is demonstrated as follows:

Reactants:                                                                                 Products:                                              

9-C                                                                                               9- C

11- H                                                                                            11- H

16- O                                                                                             16- O

3- Na                                                                                             3- Na

Evidence of Chemical Reaction

Besides the temperature change, there were a few sign to show that a chemical change occurred. One sign is that bubbles were formed, to show that a gas was made. The sodium bicarbonate that was poured into the citric acid dissolved into the liquid and got a darker color substance formed in the beaker.


"Trisodium Citrate." Trisodium Citrate. N.p., Jan. 2015. Web. 21 Jan. 2015.

Dictionary.com. Dictionary.com, n.d. Web. 23 Jan. 2015.

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