Keywords: soda homemade fifth grade primary school
This article is suitable for: the fifth grade of primary school.
Composition source:
This composition is about the fifth grade of primary school. The title is "Homemade Soda". Welcome to contribute.
Homemade soda water
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In hot summer, everyone must want to drink a refreshing and delicious soda, right? Then come with me and do your own!
Materials to be prepared: pure water, sugar, fruit, baking soda, citric acid.
1, seasoning. Pour half a bottle of pure water into a paper cup. Put sugar and fruit in the paper cup (people who don't like sugar can put less). Start stirring after adding, remember to stir evenly, otherwise it will affect the taste! Now the water in the paper cup has become "colored sugar water"!
2. Add baking soda. Don't add too much at a time, add a small spoon first. Baking soda is white powder and looks like flour. When baking soda falls into the water, it looks beautiful, just like a few Bai Meihua flowers blooming in the water. Then take out the stirring rod and stir the "Bai Meihua" so that it can be evenly blended into the water. At this time, the water will become a little white and look a little turbid.
3. Add citric acid. Citric acid is white and granular, especially sour, and it can't be reacted for a long time. Hehe, I tasted one. It was really sour. Add a spoonful, and the paper cup immediately boils like boiling water, and white bubbles appear, just like bubbles in soda water. This is the main ingredient of soda: carbon dioxide. The bubbles in the paper cup will disappear without a trace after a while because carbon dioxide melts in the air.
4. Taste. I tasted the "semi-finished soda" in the paper cup and found it a little salty. That's because there is too much baking soda (baking soda is salty). Just add some citric acid. If you feel too sour, add baking soda. If it is still too sour, you can add some sugar.
5. Add "steam". After the taste is adjusted, pour it into a plastic bottle, but the taste will fade. Add the same amount of baking soda and citric acid. Screw on the lid as soon as there are bubbles, or the steam will run away again!
Look, this is my homemade soda! It's still orange. Welcome to taste it! By the way, my soda has a shelf life of only one day because there is no preservative, hehe!
Are you interested in ? Try to do it!
The scientific knowledge I have learned:
Carbon dioxide is usually a colorless, odorless, nontoxic and insoluble gas. When carbon dioxide is compressed to a certain extent at 20℃, it can become a colorless liquid. Soda is actually just a bottle of carbon dioxide solution (with sugar and essence)
The scientific name of baking soda is sodium bicarbonate, which is a white powder, odorless, salty and soluble in water. Citric acid is a white crystalline powder and an important food additive in food processing industry.
☆ Carbon dioxide will dissolve in water in large quantities under pressure. Open the bottle cap, a small amount of carbon dioxide will run out of the water, and more carbon dioxide will be drunk into our stomachs. If the stomach does not absorb carbon dioxide, carbon dioxide will run out of the mouth, taking away a lot of heat, thus making people feel cool.
☆ When soda is made in factories, carbon dioxide is not produced in soda bottles through chemical reactions between substances, but is directly dissolved in the solution under strong pressure, which can greatly increase the solubility of carbon dioxide in the solution.
Tips:
Although soda can relieve summer heat and quench thirst, you can't drink too much at a time, otherwise it will dilute gastric juice, reduce digestion and sterilization, and affect appetite. Drinking a lot of iced soda has a strong cold stimulation on the stomach, which may cause abdominal pain and even induce gastroenteritis.