Distinguish between air, oxygen and carbon dioxide, and pour clarified lime water into it

1.No.

The carbon dioxide content in the air is that it does not react with the clarified lime water.

2.According to you, it should be a simple device for the Qipu generator, right? Use as you go, turn off and stop.

You pour in clear lime water, and you only detect carbon dioxide, then the air and oxygen are not detected, and you have to use a wooden strip with sparks to detect the air and oxygen.

What is device b, no diagram is bad.

Please draw a picture.

1. Take the burning wooden strip and put it into the three gas collection cylinders.

Phenomenon: The wooden strip burns normally without significant change, and the gas in the bottle is air.

The sticks burn more vigorously, and the gas inside the bottle is oxygen.

The stick goes out immediately, and the gas inside the bottle is carbon dioxide.

2. Two advantages: save medicines.

The start and end of the reaction can be controlled [If you want to end, clamp the hose and continue the reaction in the bottle, and when there is too much gas in the bottle (that is, the pressure in the bottle is stronger than the air pressure), the pressure in the bottle will press the liquid back into the long-neck funnel, and the reaction in the bottle will stop. 】

3. (Your question ......）

Looks like you're also a junior high school student, and so am I!! o(∩_o~

The phenomenon will not be obvious, the CO2 in the air is very small, with a wooden strip with sparks, the oxygen will rekindle, there is no obvious phenomenon in the air, and the carbon dioxide will be extinguished immediately.

1.Distinguish between air, oxygen and carbon dioxide, and pour clarified lime water into it

2.In the laboratory, if the reaction is stopped in a block bottle. 】

3. (Your question ......）

Looks like you're also a junior high school student, uh, and so am I.

The first reaction of carbon dioxide into the clarified lime water is: CO +Ca(OH) =CaCo +HO

A second reaction occurs when the overdose is introduced: 2Co + Ca(OH) = Ca(HCO).

Total: 2CO +CA(OH) =CA(HCO) Because the solubility of hydrated lime in water is very small, the newly prepared lime water is turbid, and it must be filtered or left (clarified) in order to obtain a clear and transparent solution), that is, a clear aqueous solution of calcium hydroxide (commonly known as hydrated lime), which is alkaline.

co2+ca(oh)2=caco3↓+h2o。Clear lime water is an aqueous solution of calcium hydroxide, which is a colorless and odorless liquid. The absorption of carbon dioxide produces a white precipitate of calcium carbonate, so it is often used to test for the presence of carbon dioxide.

If carbon dioxide is introduced, the turbid lime water will become clear again, because the excess carbon dioxide reacts with calcium carbonate and water to form soluble calcium bicarbonate, the chemical equation is: CO + H O + Caco = CA (HCO).

Notes:

Hydrated lime is different from chlorine-containing disinfectants sodium hypochlorite and calcium hypochlorite in the principle of disinfection application. However, as a neutralizing agent, it is also a member of the alkaline series, and can play a neutralizing role in acidic sewage. When used as a disinfectant, the disinfection ability of hydrated lime is weaker, and as a disinfectant, it must be in contact with water or water in the air to play its role.

Hydrated lime should be stored in a cool, ventilated warehouse. The humidity in the warehouse is good, not more than 85%. It is necessary that the packaging is well sealed to avoid moisture absorption. It should be stored separately from flammable (combustible) materials and acids, and should not be mixed. The storage area should be equipped with appropriate information to contain the spillage.

Introduction to CO2:

Carbon dioxide (carbon dioxide), a carbon oxide, the chemical formula is CO2, the chemical formula is, at room temperature and pressure, it is a colorless and odorless or colorless and odorless gas with a slightly sour aqueous solution, it is also a common greenhouse gas, and one of the components of air (accounting for the total volume of the atmosphere.

In terms of physical properties, carbon dioxide has a melting point of a boiling point of being denser than air (under standard conditions) and is soluble in water. 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.

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). Regarding toxicity, studies have shown that low concentrations of carbon dioxide are not toxic, while high concentrations of carbon dioxide can poison animals.

Exhaled air contains a higher concentration of carbon dioxide gas. Carbon dioxide and water become carbonic acid, and carbonic acid reacts with calcium hydroxide (lime water) to form water and calcium carbonate. Calcium carbonate is insoluble in water, making clear water turbid.

The low level of carbon dioxide in the air does not make the water turbid.

Therefore, the air can be distinguished from the exhaled gas with clear lime water.

OK. The air can also muddy the clarified lime water

However, since the air contains only about carbon dioxide, and the exhaled gas is 4%, as long as the mass fraction of the clarified lime water used is the same, the rate of precipitation of the lime water caused by the air and the exhaled gas is completely different. Exhaled air can almost quickly cloude the whole glass of lime water (the turbidity can disappear further after further infusion), while the introduction of clear lime water into the air will only slowly produce flocculent precipitation.

The clarified lime water reacts with carbon dioxide to produce insoluble calcium carbonate, which can distinguish whether the gas has carbon dioxide or not.

What substances are produced when carbon dioxide is introduced into clarified lime water?

1.Calcium carbonate.

2.Alumina.

The correct answer is calcium carbonate.

Clarified lime is as high as water as calcium hydroxide solution, carbon dioxide is introduced, and the two will react, calcium hydroxide and carbon dioxide form calcium carbonate.

According to the analysis of the chemical properties of carbon dioxide, carbon dioxide can make the clarified lime water turbid, which can be used to test carbon dioxide gas, and to remove carbon dioxide gas, it is necessary to choose a substance that can absorb a large amount of carbon dioxide, such as sodium hydroxide solution

Answer: Solution: Because carbon dioxide can make clarified lime water turbid, clarified lime water can be used to test whether a bottle of gas is carbon dioxide; If you want to remove carbon dioxide cracks, try not to clarify lime water, because calcium hydroxide is slightly soluble in water, it can only absorb a small amount of carbon dioxide, and the oak can be used to remove carbon dioxide with concentrated sodium hydroxide solution, and concentrated sodium hydroxide solution can absorb a large amount of carbon dioxide

Therefore, the answer is: clarified lime water, sodium hydroxide solution Comments: In the laboratory, clarified lime water is commonly used to test carbon dioxide, and sodium hydroxide solution is used to absorb carbon dioxide

Chemical Formula: Ca(OH)2 + CO2 ==CaCO3 (precipitate) + H2O

CaCO3 + CO2 + H2O ==Ca(HCO3)2 (dissolved).

CO2 is introduced into the clarified lime water to produce a precipitate (CaCO3), and then an excess CO2 is introduced to dissolve the precipitate.

Clarified lime water is added to the water, and if the water becomes turbid, it proves that there is carbon dioxide in the water.

The other is to heat the water and collect the resulting gas, which is then tested with clarified lime water. It works better that way.

Because the air gas contains too little carbon dioxide gas, the source carbon dioxide gas can make the clarified lime water turbid, and its chemical reaction is that carbon dioxide reacts with calcium hydroxide to produce calcium carbonate precipitate and water.

The reaction between calcium hydroxide and carbon dioxide must have been carried out, and calcium carbonate was generated, but the carbon dioxide content in the air was only too low to produce a small amount of calcium carbonate that could not be observed.

The reaction of calcium hydroxide and carbon dioxide must have progressed, and calcium carboate was also generated, but the carbon dioxide content in the air was only concentrated back.

The degree is too low, and the calcium carbonate is only a little bit, so small that it cannot be observed. It's like adding a grain of sugar to a glass of boiled water, although it does make it a little sweeter, but you can't feel the sweetness at all.

Too little to show up.