Write the reaction equation: NaOH-na2sio3-h2sio3-sio2

1. Reaction of sodium hydroxide with silicon oxide:

2NaOH + SiO2 = Na2SiO3 + H2O.

2. In reactions with acids, sodium silicate forms silicate acid:

Na2SiO3 + H2SO4 = H2SiO3 + Na2SO4.

Na2SiO3 + 2HCl = H2SiO3 + 2NaCl.

3. Decomposition of silicate acid into water and silica:

H2SiO3 = H2O + SiO2.

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