Si + 2 NaOH + H2O → Na2SiO3 + 2 H2 – Balanced equation

Or you want a quick look:

This is an oxidation-reduction (redox) reaction:

Si - 4 e- SiIV (oxidation)

4 HI + 4 e- 4 H (reduction)

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Reactants:

  • Si
    • Names: Silicon , Si , Element 14
    • Appearance: Steel-grey crystals or black-to-brown amorphous powder ; Black to gray, lustrous, needle-like crystals. [Note: The amorphous form is a dark-brown powder.]
  • NaOH
    • Names: Sodium hydroxide , Caustic soda , Lye
    • Appearance: White, waxy, opaque crystals ; White hygroscopic solid in various forms ; Colorless to white, odorless solid (flakes, beads, granular form).
  • H2OWater, oxidane
    • Other names: Water (H2O) , Hydrogen hydroxide (HH or HOH) , Hydrogen oxide
    • Appearance: White crystalline solid, almost colorless liquid with a hint of blue, colorless gas

Products:

  • Na2SiO3
    • Names: Sodium metasilicate , Sodium metasilicate (anhydrous) , Sodium sesquisilicate
    • Appearance: Colourless-to-white hygroscopic solid in various forms
  • H2
    • Names: Dihydrogen , Hydrogen , H2
    • Appearance: Odourless colourless compressed gas
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