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SO4(-2) 4は下付き -2だ O化価格は-2 Sは正6
生石灰はCa(OH)2石灰岩の主成分であるCaCO3 +H2O=Ca(OH)2 Ca(OH)2+CO2=CaCO3+H2O CaCO3=0+CO2反応条件は高温
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