Si→Mg2Si→SiH4→SiO2→Na2SiO3→H2SiO3

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Here is the chemical reaction pathway:

Silicon reacts with magnesium to form magnesium silicide: Si + Mg → Mg2SiMagnesium silicide reacts with hydrogen to form silane gas: Mg2Si + 4H2 → SiH4Silane gas oxidizes in air to form silicon dioxide: SiH4 + O2 → SiO2 + 2H2OSilicon dioxide reacts with sodium hydroxide to form sodium silicate: SiO2 + 2NaOH → Na2SiO3 + H2OSodium silicate reacts with acid to form silicic acid: Na2SiO3 + 2HCl → H2SiO3 + 2NaCl

This is the chemical reaction pathway from silicon to silicic acid via magnesium silicide, silane gas, silicon dioxide, and sodium silicate.