Cao+h2o=ca(oh)2
cao+2hcl=cacl2+h2o
cao+co2=caco3
so2+h2o=h2so3
so2+ca(oh)2=caso3+h2o
so2+cao=caso3
ca(oh)2+2hno3 =ca(no3)2+2h2o
ca(oh)2+co2 =caco3+h2o
ca(oh)2+na2co3=caco3+2naoh
2hcl+mg=mgcl2+h2
2hcl+na2o=2nacl+h2o
hcl+naoh=nacl+h2o
hcl+agno3=agcl+hno3
cuso4+zn=znso4+cu
cuso4+bacl2=baso4+cucl2