Question

Осуществить превращения :Ca→CaO2 →Ca(OH)2→CaCO3→CaCl2

Answer 1

2Ca+O2=2CaO
CaO+H2O=Ca(OH)2
Ca(OH)2+CO2=CaCO3+H2O
CaCO3+2HCl=CaCl2+CO2+H2O

Answer 2

$2Ca+O_2=2CaO$
$CaO+H_2O=Ca(OH)_2$
$Ca(OH)_2+K_2CO_3=CaCO_3+2KOH$
$CaCO_3+2NaCl=CaCl_2+Na_2CO_3$