Laboratory melting caustic soda can be used as a material for the manufacture of crucibles

The answer is A, because the main component of glass is silica, the component of quartz is silica, and caustic soda reacts with them, and the component of porcelain is mainly silica, which can also react with caustic soda. But it does not react with iron. So pick A, do you understand?

A, this is a chemistry question, the answer is A, because caustic soda is strongly corrosive, but it does not react with iron, glass and quartz are both silica, which will react, as for porcelain, it seems that it can also be, but there seems to be no porcelain crucible.

Due to the choice of D porcelain. Caustic soda is sodium hydroxide, glass and quartz contain silicon, sodium hydroxide will react with them, and b glass c quartz cannot be used. Sodium hydroxide does not react with porcelain.

d.Caustic soda is NaOH, it is corrosive, so it cannot be used in iron pots, and glass and quartz contain SiO2, which will react with NaOH to form a viscous substance

Caustic soda is NAOH This is a strong alkali that will corrode the iron pot, so you can't choose A, the main component of glass is quartz sand, that is, silica or calcium silicate, which will react with NaOH to form silicate, so you can't choose B, C is the same reason.

Last pick D

a！！！The latter three substances contain silica, which can react chemically with alkaline substances!

Upstairs, don't talk nonsense if you don't understand!!

Ordinary glass crucibles, quartz crucibles, and ceramic crucibles all contain silica.

Silica can react with caustic soda: SiO2+2NaOH==Na2SiO2+H2O

Therefore, ordinary glass crucibles, quartz crucibles and ceramic crucibles cannot be used to melt caustic soda. Instead, an iron crucible should be used, and iron and caustic soda do not react.

Summary. When using a silver crucible as a container and sodium hydroxide as a flux, iron ore and other samples should be pre-fired at 700 750, hello, this question has obvious breaks, you can shoot me the complete question, let me answer.

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AbstractWhen using a silver crucible as a container and sodium hydroxide as a flux, iron ore and other samples should be pre-fired at 700 750 °C.

a. The melting point of iron is high, and it can be used as a material for making this crucible without reacting with sodium hydroxide, so a is correct;

B. The glass is not resistant to high temperature, and the silica in the glass reacts with sodium hydroxide, so it cannot be used as a material for the manufacture of this crucible, so B is wrong;

c. Silica has a high melting point, but it reacts with sodium hydroxide and cannot be used as a material for making this crucible, so C is wrong;

d. The ceramic contains silica and sodium hydroxide to react, and cannot be used as a material for the manufacture of this crucible, so D is wrong;

So choose A

Sodium hydroxide is a strong base that reacts with acids, acidic oxides and aluminium metal

a. The porcelain crucible contains silica, which is an acidic oxide that can react with sodium hydroxide, so a is wrong;

B. The composition of quartz is silica, which is an acidic oxide that can react with sodium hydroxide, so B is wrong;

c. Iron and sodium hydroxide do not react, and the crucible for heating and melting sodium hydroxide should be selected as an iron crucible, so C is correct;

d. Aluminum is a special metal, which can react with acid and alkali to form salt and water, so D is wrong

Therefore, C

Sodium hydroxide is a strong base that can react with acids, acidic oxides and metal aluminum

a. The porcelain crucible contains silica, which is an acidic oxide that can react with sodium hydroxide, so a is wrong;

B. The ingredient of the stone stimulus is silica, which is an acidic oxide that can react with sodium hydroxide, so B is wrong;

c. Iron and sodium hydroxide do not react, and the crucible for heating and melting sodium hydroxide should be selected as an iron crucible, so C is correct;

d. Aluminum is a special metal, and lead can react with acid and alkali to form salt and water, so D is wrong

Therefore, C

a. The melting point of iron is high, and it can be used as a material for making this crucible without reacting with sodium hydroxide, so a is correct;

B. The glass is not resistant to high temperature, and the silica in the glass reacts with sodium hydroxide, so it cannot be used as a material for the manufacture of this crucible, so B is wrong;

c. Silica has a high melting point, but it reacts with sodium hydroxide and cannot be used as a material for making this crucible, so C is wrong;

d. The ceramic contains silica and sodium hydroxide to react, and cannot be used as a material for the manufacture of this crucible, so D is wrong;

So choose A

Question Answer: C

Li Song analysis of the rubber code question: how can there be SiO2 in the porcelain crucible and quartz crucible, which reacts with NaOH if there is a beam disturbance; Al in the aluminium crucible also reacts with NaOH