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Question

NaOH+?-Na2SO4+?
Cu(OH)2+?-CuSo4+?
?+CuSO4-Cu(OH)2+?
?+CO2-Na2CO3+?
Cu(OH)2-t-?+?
?+HCL=AlCl3+H2O
Al2(SO4)3+?=Al(OH)3+?

Answer 1

NaOH + H2SO4 -> Na2SO4 + H2O
Cu(OH)2 + H2SO4 -> CuSO4 + H2O
NaOH + CuSO4 -> Cu(OH)2↓ + Na2SO4
NaOH + CO2 -> Na2CO3 + H2O
Cu(OH)2 -> CuO + H2O
Al(OH)3 + HCl -> AlCl3 + H2O
Al2(SO4)3 + KOH -> Al(OH)3↓ + K2SO4