Silicon was dissolved in concentrated sodium hydroxide solution. Carbon dioxide was passed through the resulting solution. The formed precipitate was filtered off, dried, and divided into two parts. The first was dissolved in hydrofluoric acid, the second was fused with magnesium. Write the equations for the described reactions.
Si + 2NfOH + H2O → NaSiO3 + 2H2↑
Na2SiO3 + CO2 → Na2CO3 + SiO2↓
SiO2 + 4HF → SiF4 + 2H2O
SiO2 + 2Mg → Si + 2MgO
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