When citric acid (or tartaric acid) and baking soda (NaHCO3) are dissolved in water, they can react chemically to produce carbon dioxide gas. Carbon dioxide gas dissolved in water containing sugar, fruit juice and other ingredients can be made into soda.

Tools and materials?

Plastic coke bottle, balance. ?

Citric acid, baking soda, salt, sugar, fruit juice, cold boiled water. ?

Activity process?

1, take a clean plastic coke bottle, add proper amount of sugar (or salt), fruit juice,1.5g baking soda, cold boiled water (don't fill the bottle too full) and1.5g citric acid in turn, and immediately screw the bottle cap to prevent the soda from rushing out. ?

2, gently shake the coke bottle, observe the phenomenon. ?

A large number of bubbles were found in the bottle. Because the bottle cap is screwed tightly, the generated gas cannot escape. After about 15 minutes, the homemade soda can be drunk. ?

Description and extension?

1, In summer, when you drink a bottle of soda, a lot of carbon dioxide gas dissolved in soda will enter the human body, but it will not be absorbed by the stomach, and it will not be easily dissolved in water, so it will be discharged from the mouth soon, and people often burp at this time. Because part of the heat in the human body is also taken out by carbon dioxide, people will feel very cool. ?

2. When making soda in the factory, carbon dioxide gas is not produced in the soda bottle through chemical reaction between substances, but directly dissolved into the solution under strong pressure, which can greatly increase the solubility of carbon dioxide in the solution.