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Giải thích các bước giải:

Bài 1 :

a) NaOH ---> NaCl ---> NaOH ---> Na2SO4

(1) NaOH + HCl ---> NaCl + H2O

(2) 2NaCl + 2H2O ---> 2NaOH + H2 +Cl2   (Điện phân có màng ngăn)

(3) 2NaOH + H2SO4 ---> Na2SO4 + 2H2O

b) Na2O ---> Na2SO3---> Na2SO4 ---> NaCl

(1) Na2O + SO2 ---> Na2SO3

(2) Na2SO3 + H2SO4 ---> Na2SO4 + H2O + SO2O

(3) Na2SO4 + BaCl2 ---> BaSO4 + 2NaCl

c) CaCO3---> CaO ---> Ca(OH)2---> CaCO3

(1) CaCO3 ---> CaO + CO2 

(2) CaO + H2O ---> Ca(OH)2

(3) Ca(OH)2 + K2CO3 ---> CaCO3 + 2KOH

Bài 2 :

a)Cu(OH)2, Ba(OH)2, NaOH

Cu(OH)2 + 2HCl ---> CuCl2 + 2H2O

Ba(OH)2 + 2HCl ---> BaCl2 + 2H2O

NaOH + HCl ---> NaCl + H2O

b) Cu(OH)2

Cu(OH)2 ---> CuO + H2O

c) Ba(OH)2, NaOH

Ba(OH)2 +CO2 ---> BaCO3 + H2O

Ba(OH)2 +2CO2 ---> Ba(HCO3)2

NaOH +2CO2 ---> Na2CO3 + H2O

NaOH+CO2 ---> NaHCO3

d) Ba(OH)2, NaOH

Em tham khảo nha:

\(\begin{array}{l}
1)\\
a)\,NaOH \to NaCl \to NaOH \to N{a_2}S{O_4}\\
NaOH + HCl \to NaCl + {H_2}O\\
2NaCl + 2{H_2}O \to 2NaOH + C{l_2} + {H_2}\\
2NaOH + {H_2}S{O_4} \to N{a_2}S{O_4} + 2{H_2}O\\
b)\\
N{a_2}O \to N{a_2}S{O_3} \to N{a_2}S{O_4} \to NaCl\\
N{a_2}O + S{O_2} \to N{a_2}S{O_3}\\
N{a_2}S{O_3} + {H_2}S{O_4} \to N{a_2}S{O_4} + S{O_2} + {H_2}O\\
N{a_2}S{O_4} + BaC{l_2} \to 2NaCl + BaS{O_4}\\
c)\\
CaC{O_3} \to CaO \to Ca{(OH)_2} \to CaC{O_3}\\
CaC{O_3} \to CaO + C{O_2}\\
CaO + {H_2}O \to Ca{(OH)_2}\\
Ca{(OH)_2} + C{O_2} \to CaC{O_3} + {H_2}O\\
2)\\
a)\\
Cu{(OH)_2} + 2HCl \to CuC{l_2} + {H_2}O\\
Ba{(OH)_2} + 2HCl \to BaC{l_2} + 2{H_2}O\\
NaOH + HCl \to NaCl + {H_2}O\\
b)\\
Cu{(OH)_2} \to CuO + {H_2}O\\
c)\\
Ba{(OH)_2} + C{O_2} \to BaC{O_3} + {H_2}O\\
2NaOH + C{O_2} \to N{a_2}C{O_3} + {H_2}O\\
d)\\
NaOH,Ba{(OH)_2}
\end{array}\)