What is the reason for the rubber stopper instead of the glass stopper for the reagent containing th

Because the four soluble bases (i.e., sodium hydroxide, potassium hydroxide, barium hydroxide, calcium hydroxide) can react with carbon dioxide in the air to deteriorate into carbonate, so they need to be sealed and preserved, and the sealing degree of the glass stopper is not good enough for rubber stoppers, and there will be a certain amount of air entering the bottle. The best example is: concentrated hydrochloric acid is volatile, can corrode rubber and other organic matter and all active metals, so the thin bottle of concentrated hydrochloric acid will be plugged with a glass stopper, and after a period of time, there will be a white mist when the lid is opened, this is because after the concentrated hydrochloric acid volatilizes into a gaseous state, it encounters the acid mist formed after the liquefaction of water molecules in the air, before opening the bottle mouth, you carefully observe the bottle mouth part, you will find that there will be a small amount of liquid gathered near the bottle stopper, which is the difference between the air tightness of the glass stopper and the rubber stopper.

The alkali does not react much with the rubber, and the rubber stopper has good air tightness, so the reason why the rubber stopper for soluble alkali such as sodium hydroxide is not used in the laboratory is not glass. Hope it helps.

SiO2+2NaOH = Na2SiO3+H2O, the generated Na2SiO3 is commonly known as water glass, which has strong viscosity, and if you use a glass stopper Na2SiO3 will stick the bottle mouth and the cap tightly together, and it is difficult to open when you want to use it. So you can't use a glass stopper.

Sodium hydroxide reacts with glass stoppers to form sticky glass glue.

Chemical equation: SiO2+2NaOH ===Na2SiO3+H2O Hope, thank you! If satisfied,!

Your motivation keeps me going!

Silica is a component of glass, and silica reacts with sodium hydroxide to form sodium silicate, which makes the bottle and cap stick together and cannot be opened.

The composition of glass is silicon dioxide, silica reacts with a strong alkali, SiO2 + 2NaOH = Na2SiO3 + Na2SiO3 generated by H2O, which has a strong stickiness and is not easy to open the lid!

Because it is very simple, because sodium hydroxide (NaOH) is alkaline, it can chemically react with glass (the composition is wax dioxide and silicon SiO2).

Naoh + SiO2 == Na2SiO3 + H2ONa2SiO3 is called sodium silicate (commonly known as water glass) is easy to turn into glass when dry, and the glass stopper and reagent bottle are glued together, resulting in the inability to open.

Reagent bottles used in laboratories for alkaline substances generally do not use glass covers, hail stoppers, and rubber stoppers (e.g., sodium carbonate, Na2CO3, and potassium hydroxide KOH).

Because NAOH is alkaline, it can react chemically with glass (the composition is silica SiO2).

naoh+sio2==na2sio3+h2o

Because sodium hydroxide will react with silica chemically.

The reason why the reagent bottle containing gasoline cannot be used with a rubber stopper is because.

The main components of gasoline are C5-C12 aliphatic hydrocarbons and naphthenic hydrocarbons, and a certain amount of aromatic hydrocarbons. It is a non-polar organic solvent.

Rubber is a non-polar organic molecule.

When gasoline comes into contact with the rubber, it will cause the rubber to swell and not be easy to open.

Gasoline is a combustible item, and after the cork is corroded, it is easy to leak, and it will burn in case of fire.

Since the main component of the glass stopper is silica, silica can react with sodium hydroxide solution to form viscous sodium silicate, which sticks the glass stopper and the glass bottle together, so the reagent bottle with the glass stopper can not be used to hold the sodium hydroxide solution, and a rubber stopper or cork can be used.

The chemical equation for the reaction of silica with sodium hydroxide solution is:

sio2+2naoh═na2sio3+h2o。

Sodium hydroxide is slightly corrosive to glass, and both produce sodium silicate, which causes the piston in the glass instrument to stick to the instrument. Therefore, glass stoppers should not be used when containing sodium hydroxide solution, as this may cause the cap to not be opened.

Sodium hydroxide can be used as an alkaline cleaning agent in water treatment, soluble in ethanol and glycerol; Insoluble in propanol, ether. It disproportionates with halogens such as chlorine, bromine, and iodine. It neutralizes with acids to form salt and water.

Industrial method: There are three methods for producing caustic soda in industry: causticizing method, electrolysis method and ion exchange membrane method.

Applications: Sodium hydroxide (NaOH) is extremely versatile. It is used in the production of paper, soap, dyes, rayon, metal smelting, petroleum refining, cotton fabric finishing, purification of coal tar products, as well as food processing, wood processing and machinery industry.

Chemical industry: Sodium hydroxide is widely used in the national economy, and sodium hydroxide is required in many industrial sectors. The largest use of sodium hydroxide is in the manufacture of chemicals, followed by paper, aluminum, tungsten, rayon, rayon and soap.

Because sodium hydroxide (NaOH) is alkaline, it can have a chemical reaction with glass (the composition is silica SiO2): NaOH + SiO2 = = Na2SiO3 + H2ONa2SiO3 is called sodium silicate (commonly known as water glass) is easy to turn into glass when dry, and the glass stopper and reagent bottle are glued together, resulting in inability to open. Reagent bottles used in laboratories for alkaline substances generally do not use glass stoppers and rubber stoppers (e.g

sodium carbonate Na2CO3 and potassium hydroxide KOH).

The glass stopper is made of silica, and the sodium hydroxide reacts with the silica to produce sodium silicate, a binder, and your glass stopper sticks and can't be pulled out.

The equation is as follows: SiO2+2NaOH+H2O=Na2SiO3+2H2

First of all, most of the bottles containing NaOH solution reagents are frosted glass bottles, which fit well with the frosted glass stoppers. If the bottle containing the NaOH solution is plastic, it can be corked with a glass bottle.

The kind you are talking about happens to be a frosted glass bottle, the reason is that after pouring the NaOH solution, the NaOH solution reacts with the frosted glass to form glass glue, which is also known as water glass, which can be used to glue the glass so that the glass bottle cannot be opened.

Chemical equation: 2NaOH+SiO2===H2O+Na2SiO3

NaOH reacts with glass and makes the stopper stick to the bottle, so you must not use a glass stopper, and this is also the reason why alkaline burettes are not glass stoppers.

NaOH and glass (the main ingredient SiO2) will react to form sodium silicate (Na2SiO3), sodium silicate, also known as water glass, is viscous.

The glass bottle is smooth, has surface stress, and doesn't react with NAOH, but the glass stopper is frosted, and it reacts with NAOH.

It reacts with the glass to form glass glue, making the glass bottle impossible to open.

Chemical equation: 2NaOH+SiO2===H2O+Na2SiO3

The reason why the reagent bottle containing NaOH solution in the laboratory does not use a glass stopper is that NaOH can react with glass.

NaOH can be projected with sodium silicate, the main component of glass, to form silicic acid, 2NaOH + SiO2 = Na2SiO3 + H20

The glass stopper cannot be separated from the glass bottle.

The composition of the glass is SiO2, and NaOH and SiO2 can react: 2NaOH + SiO2 ===Na2SiO3 + H2O to make the bottle body and stopper stick together.

NaOH can react with sodium silicate, the main component of glass, to form silicic acid, which is a viscous substance.

Glass contains silica, silica can react with strong alkali to form silicate and water, such as silica can react with sodium hydroxide to form sodium silicate and water

sio2+2naoh=na2

sio3+h2

o, sodium silicate is a viscous substance, causing the stopper to stick to the mouth of the bottle, so the reagent bottle containing lye cannot be corked with glass

So the answer is: SiO2

2naoh=na2

sio3+h2o．