Question

Si - SiO2 --> Na2SiO3 --> H2 SiO3 --> SiO2 --> Si

Answer 1

Si + O2 (t)= SiO2

SiO2 + Na2O (t)= Na2SiO3

Na2SiO3 + 2HCl = 2NaCl + H2SiO3

H2SiO3 (t)= H2O + SiO2

SiO2 + C (t)= CO2 + Si

Answer 2

The chemical equation you provided describes the conversion of silicon dioxide (SiO2) into silicon (Si) through several intermediate steps.

The first step involves the reaction of silicon (Si) with silicon dioxide (SiO2) to form sodium silicate (Na2SiO3) and heat:

Si + SiO2 → Na2SiO3 + heat

The resulting sodium silicate can then react with an acid, such as sulfuric acid (H2SO4), to form silicic acid (H2SiO3) and sodium sulfate (Na2SO4):

Na2SiO3 + H2SO4 → H2SiO3 + Na2SO4

The silicic acid can then lose water to form silicon dioxide (SiO2):

H2SiO3 → SiO2 + H2O

Finally, the silicon dioxide can be reduced to silicon (Si) through a chemical reaction with a reducing agent, such as carbon:

SiO2 + 2C → Si + 2CO

Overall, the complete reaction pathway can be represented by the following chemical equation:

Si + 2C → SiC (carbide)

SiC + 2SiO2 → 3Si + 2CO2

Therefore, the initial reaction (Si + SiO2 → Na2SiO3) is not sufficient to convert silicon dioxide into silicon. Additional steps, including the use of reducing agents, are necessary to complete the process.