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Kamekaze228
@Kamekaze228
July 2022
1
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Решить две схемы превращения:
1) SiO2→Si→K2SiO3→H2SiO3→SiO2→Na2SiO3→SiO2;
2) MgCO3→CO2→Ca(HCO3)2→CaCO3→CO2;
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innysik51511
1)
SiO2 + 2C =Si + 2CO
Si + H2O + 2KOH = K2SiO3 + 2H
2
K2SiO3 + 2 HNO3 = 2 KNO3 + H2SiO
3
H2SiO3 = SiO2 + H2O
SiO2 + Na2SO4 = Na2SiO3 + SO
3
Na2SiO3 + CO2 → SiO2 + Na2CO
3
2)
MgCO3 = MgO + CO
2
CaCO3 + CO2 + H2O =Ca(HCO3)
2
Ca(HCO3)2 = CaCO3 + CO2 + H2O
CaCO3 = CaO + CO
2
2 votes
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Answers & Comments
Si + H2O + 2KOH = K2SiO3 + 2H2
K2SiO3 + 2 HNO3 = 2 KNO3 + H2SiO3
H2SiO3 = SiO2 + H2O
SiO2 + Na2SO4 = Na2SiO3 + SO3
Na2SiO3 + CO2 → SiO2 + Na2CO3
2)MgCO3 = MgO + CO2
CaCO3 + CO2 + H2O =Ca(HCO3)2
Ca(HCO3)2 = CaCO3 + CO2 + H2O
CaCO3 = CaO + CO2