Write the reaction equation: Si – SiO2 – Na2SiO3 – H2SiO3 SiO2 – SiF4 SiO2 – Si
October 9, 2021
a). 1. Heating silicon in an oxygen atmosphere, 400-500 ° C.
Si + O2 = SiO2.
2. Reaction of silicon oxide with alkali to form sodium silicate.
SiO2 + 2NaOH = Na2SiO3.
3. Getting silicate acid.
Na2SiO3 + 2HCl = H2SiO3 + 2NaCl.
b) The action of fluorine on silicon oxide with the formation of silicon fluoride, 250-400 ° C.
SiO2 + 2F2 = SiF4 + O2.
c) Calcining sand with magnesium.
SiO2 + 2Mg = 2MgO + Si.
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