Small family experiment

Happy family experiment: carbonate experiment

Carbonate can react with hydrochloric acid to generate carbon dioxide, which can be used to test CO32-there are many carbonates in daily life, such as soda ash, marble and egg shells at home, so we decided to test which items contain CO32 with home materials-and design some interesting experiments.

Experiment 1: detection of carbonate ion

Experimental supplies: transparent glass, tweezers, white vinegar, soda ash, broken marble, broken glass, toothpaste, egg shell, scale of thermos bottle, etc.

Experimental process:

1, take 6 transparent glasses and number them with numbering paper according to 1, 2, 3, 4, 5 and 6 respectively;

2. Add the scales of soda ash, broken marble, broken glass, toothpaste, egg shell and thermos bottle into six numbered glasses respectively;

3. Add thick white vinegar to 6 transparent glasses.

4. Observe carefully and make records. Obtain experimental records:

1 2 No.3 No.4 No.5 No.6

A large number of bubbles are generated quickly in 24 hours, and bubbles are generated slowly. No bubbles, bubbles, bubbles, bubbles.

Experimental explanation:

1, the main component of soda ash is sodium carbonate, the main component of marble is calcium carbonate, toothpaste contains friction agent calcium carbonate, and the scale of egg shell and thermos bottle contains calcium carbonate, which can react with acetic acid in white vinegar to generate carbon dioxide. Glass is made of limestone, soda ash and silicon dioxide. Chemical changes took place during the melting process. There is no carbonate in the glass, so there are no bubbles.

2. Soda Soda can be dissolved in water and fully contacted with acetic acid, so the reaction is the fastest.

Experiment 2: Homemade Eggs

Experimental supplies: glass, eggs, white vinegar, crayons of various colors, etc.

Experimental process:

1, take an egg, wash the surface stains, and dry;

2. Carefully draw patterns of various styles and colors you want on the eggshell with crayons;

3. Add an appropriate amount of white vinegar to the glass, soak the patterned eggs in the white vinegar, and stir the eggs with chopsticks to make them contact the solution evenly for about half an hour;

4. Take out the eggs, rinse them with clear water and dry them;

5. Punch two small holes in the proper position of the egg, blow air into the egg from one small hole, let the contents of the egg flow out from the other small hole, catch the spilled protein and yolk with a bowl, and then carefully clean the remaining yolk and protein in the eggshell to successfully make a painted egg.

Experimental explanation:

Because wax can prevent calcium carbonate in eggshell from reacting with weak acid acetic acid in white vinegar, the part without wax will react with acetic acid, thus changing the color of eggshell. In this way, you can get eggs with scattered and contrasting patterns.

Imitating this method, we also wrote a raised male character mark similar to "We love chemistry" on the marble.

Family experiment is an extension and supplement of classroom learning. Completing the carefully designed family experiment closely combined with the textbook content can not only make us taste the happiness of success, enhance our confidence in learning, but also further consolidate and improve the knowledge we have learned. We might as well do it. The chemical experiment is just around the corner.