1:

naoh +hno3=h2o+nano3

bao+2hno3=ba(no3)2+h2o

so2+naoh=nahso3

2:

cu+cl2=cucl2

cucl2+h2o=cu(oh)2+hcl

cu(oh)2=cuo+h2o(прокаливание)

cuo+h2so4=cuso4+h2o

2cuso4+2h2o=2cu+o2+2h2so4 (электролиз)

3:

caco3

caoh2+h2co3=caco3+2h2o

hcl

cl2+h2=2hcl