How to test for carbon dioxide in soda

First of all, it should be like carbon dioxide.

What are the features?

1) Nature: soft drink.

It contains carbonic acid, which is extremely unstable and easily decomposes into carbon dioxide and water, and carbon dioxide makes the clarified lime water turbid.

Design experiment: We can gently open the purchased soda, then cover the bottle with a balloon, and then shake the soda to release the dissolved carbon dioxide inside, we collect it through the balloon, and then pass the collected gas through the clarified lime water.

If the lime water becomes cloudy, it means that there is carbon dioxide in the soda, and if there is no significant change, there is no carbon dioxide.

2) Properties: Soda contains carbonic acid, which is regarded as carbon dioxide and water reaction. It just so happens that carbonic acid will turn the purple litmus solution light red.

Design experiment: take a test tube, add purple litmus test solution dropwise, and pour the soda into the purple litmus test solution immediately If the purple litmus test solution turns light red, it can indicate that the soda contains carbon dioxide.

We can gently open the soda we bought, and then cover the bottle with a balloon, and then shake the soda to release the dissolved carbon dioxide inside, we collect it through the balloon, and then pass the collected gas through the clarified lime water, if the lime water becomes turbid, it means that there is carbon dioxide in the soda, if there is no obvious change, it means that there is no carbon dioxide.

The method on the second floor is preferable, but it is more troublesome, you can just light a toothpick or a small piece of paper, move it to the mouth of the soda bottle, and if it goes out relatively quickly, there is CO2

Shake the soda first, then remove the lid so that the gas rushes towards the clarified lime water. If lime water becomes turbid, it is carbon dioxide.

Buy some quicklime, where you can buy it in the house, put it in water, not too much, and then pour it into the soda, if there is sediment generated, there is CO2

CO2 is passed into the clarified lime water, and the clarified lime water becomes turbid. If CO2 is continued, the turbid clarified lime water will become clear again.

Ca(OH)2 + CO2 = CaCO3 (white precipitate) + H20

Ca(OH)2+2CO2 (excess) = Ca(HCO3)2

Blow into the soda -- If the soda becomes cloudy, it means that the soda contains carbon dioxide.

Here's how to make carbon dioxide in the lab:

1.Carbon dioxide is prepared in the laboratory, and it is reacted with dilute hydrochloric acid with marble or limestone, and the main component of their posture is calcium carbonate, and the products are calcium chloride, water and carbon dioxide, and the equation is: CaCO3+2HCl, CaCl2+H2O+CO2.

2.Carbon dioxide can be dissolved in water, react with water to form carbonic acid, can not be collected by drainage method, because the density is greater than air, can be collected by upward air exhaust method; When testing carbon dioxide, the properties of calcium carbonate precipitation are generated by the reaction of carbon dioxide and calcium hydroxide, and the method is to pass the prepared gas into the clarified lime water, and if the lime water becomes muddy, the gas is carbon dioxide.

Here's how to make carbon dioxide in the lab:

1.Carbon dioxide is prepared in the laboratory, and it is reacted with dilute hydrochloric acid with marble or limestone, and the main component of their posture is calcium carbonate, and the products are calcium chloride, water and carbon dioxide, and the equation is: CaCO3+2HCl, CaCl2+H2O+CO2.

2.Carbon dioxide can be dissolved in water, react with water to form carbonic acid, can not be collected by drainage method, because the density is greater than air, can be collected by upward air exhaust method; When testing carbon dioxide, the properties of calcium carbonate precipitation are generated by the reaction of carbon dioxide and calcium hydroxide, and the method is to pass the prepared gas into the clarified lime water, and if the lime water becomes muddy, the gas is carbon dioxide.

Method of testing carbon dioxide: gas is passed into the clarified lime water, if the clarified lime water becomes turbid, the gas is carbon dioxide, and vice versa.

Carbon Dioxide Test Method:

1. Introduce colorless gas into clear lime water. If the solution becomes turbid, it indicates that the gas contains CO.

2. Bromothymol blue aqueous solution can identify carbon dioxide (CO), and the solution changes from blue to green and then to yellow.

Principle of carbon dioxide test for clarified lime water:

Carbon dioxide passes into the clarified lime water and becomes turbid, because carbon dioxide reacts with the clarified lime water to form calcium carbonate precipitation.

The chemical equation is: Co +Ca(OH) = CaCo +H O

Air, carbon dioxide, and water vapor are respectively introduced into the clarified lime water, and there is obvious white precipitation to produce CO2, a small amount of white precipitation, and the turbidity rises slightly for air, and water vapor does not produce precipitation, that is, the turbidity does not change. The main component of lime water is calcium hydroxide [Ca(OH)2], which reacts with carbon dioxide to form calcium carbonate and water (Ca(OH)2 + CO2 = CaCO3 + H2O).

When there is more undissolved hydrated lime in lime water, it is called lime milk or lime slurry. Walls are painted with lime mortar for slag leakage on buildings; Applying lime slurry containing sulfur powder to the trees can protect the tree, prevent frostbite, and prevent pests from laying eggs; In agriculture, lime milk and copper sulfate can be used to prepare Bordeaux liquid with bactericidal effect as a pesticide.

Related information

The solute of the prepared calcium hydroxide solution is calcium hydroxide, so to prepare calcium hydroxide, it is known that the drug contains quicklime and distilled water, so the reaction of quicklime and distilled water to generate calcium hydroxide, and because calcium hydroxide is slightly soluble in water, it is a suspension to obtain, so the undissolved calcium hydroxide needs to be removed.

The method of separating the solid and liquid of the insoluble liquid is filtration, and the calcium hydroxide solution can be obtained by filtering to remove the calcium hydroxide that is insoluble in water.

Air, carbon dioxide, water vapor is distinct, do not pass into the clear lime water, there is obvious white precipitation produced by the hand of the acacia for CO2, a small amount of white precipitation, the turbidity slightly rises for the air, does not produce precipitation, that is, the turbidity does not change is water vapor.

The gas is passed into a mixture of calcium carbonate and water, and if the precipitate dissolves is observed, it means that there is CO2 in the gas, otherwise there is none.

Equation: CO2 + H2O + CaCO3 = = Ca(HCO3)2

Summary. The reagents that contain carbon dioxide in homemade soda are citric acid and baking soda. Citric acid can react with baking soda to form citrate and water, which fills homemade soda with foam, making it even more delicious.

The reagents that contain carbon dioxide in homemade soda are citric acid and baking soda. Citric acid can be rented to react with baking soda to form citrate and water, which fills the homemade soda with foam, thus making the soda more important and delicious.

What is the chemical equation associated with it.

The chemical equation for the reaction of citric acid and baking soda is: C6H8O7 + 3NaHCO3 3CO2 + 3H2O + 3NaC6H5O7. This reaction is due to the reaction of citric acid with sodium carbonate in the mold base of baking soda to form carbon dioxide, cress and sodium citrate.

Carbon dioxide test method: The generated gas is passed into the clarified lime water, and the lime water becomes turbid, which proves that the gas is carbon dioxide. Carbon dioxide can generally be prepared by calcining limestone at high temperature or by the reaction of limestone and dilute hydrochloric acid, and is mainly used in refrigerating perishable food (solid), as a refrigerant (liquid), in the manufacture of carbonized soft drinks (gaseous) and as a solvent for homogeneous reaction (supercritical state).

In terms of chemical properties, carbon dioxide is chemically inactive, has high thermal stability (only decomposition in 2000), cannot be burned, and usually does not support combustion, it belongs to acid oxides, has the general properties of acid oxides, and is an acid anhydride of carbonic acid because it reacts with water to form carbonic acid.

The gas is passed into the clarified lime water, and if it becomes turbid, it indicates the presence of carbon dioxide.

1. The acidic substance produced by the reaction of carbon dioxide with water can turn purple litmus red. When the purple litmus turns red, it turns back to purple.

As a result, carbon dioxide reacts with water to form acidic substances.

2. Carbon dioxide can make the clarified lime water turbid, and it can be judged whether the gas in the gas collection cylinder is carbon dioxide.

The test introduces carbon dioxide into the clarified lime water, which produces a white calcium carbonate precipitate.

Ca(OH)2+CO2 CaCO3+H2O, but SO2 is reducible, gas must be passed into sufficient acidic potassium permanganate solution first, and then tested with clarified lime water after SO2 is removed.

3. The aqueous solution of carbon dioxide is weakly acidic, which will make the red phenolphthalein colorless.

Carbon dioxide is a gas that can make a calcium hydroxide solution turbid and then continue to pass through, and if the solution becomes clear from turbidity, then the gas is carbon dioxide. If you can't, you don't. Carbon dioxide reacts with calcium carbonate and water to form calcium bicarbonate, and the solution becomes clear.

Indeed, if it is not appropriate to use only calcium hydroxide solution, just add one step. It is to acidify the generated precipitate with dilute nitric acid, and if there is a colorless gas, it is CO2, and if there is a red gas, it is SO2

Note that CaSO3 will be oxidized to CaSO4 by dilute nitric acid, and the reduction product NO will be rapidly oxidized to NO2 by air and will appear red).

Stick a spark into the gas collector cylinder, if the stick goes out, it may be carbon dioxide; The ignited magnesium strip is then inserted into another same gas cylinder, and the magnesium strip continues to burn, which can be determined to be carbon dioxide.

Carbon dioxide production, collection and testing.