viết PTHH hoàn thành dãy biến hóa sau(ghi rõ đkpứ nếu có)
a.\(Na\underrightarrow{\left(1\right)}Na_2O\underrightarrow{\left(2\right)}NaOH\underrightarrow{\left(3\right)}Na_2SO_4\underrightarrow{\left(4\right)}NaCl\)
b.\(CaO\underrightarrow{\left(1\right)}Ca\left(OH\right)_2\underrightarrow{\left(2\right)}CaCO_3\underrightarrow{\left(3\right)}CaO\underrightarrow{\left(4\right)}CaCl_2\)
a) 1: Na + O2 \(\rightarrow\) Na2O
2: Na2O + H2O \(\rightarrow\) 2NaOH
3: NaOH + SO3 \(\rightarrow\) Na2SO4 + H2O
4: Na2SO4 + BaCl2 \(\rightarrow\) NaCl + BaSO4
b) 1: CaO + H2O \(\rightarrow\) Ca(OH)2
2: Ca(OH)2 + H2CO3 \(\rightarrow\) CaCO3 + 2H2O
3: CaCO3 \(\underrightarrow{t^o}\) CaO + CO2
4: CaO + HCl \(\rightarrow\) CaCl2 + H2O
a) 1. 4Na + O2 → 2Na2O
2. Na2O + H2O → 2NaOH
3. 2NaOH + H2SO4 → Na2SO4 + 2H2O
4. Na2SO4 + BaCl2 → 2NaCl + BaSO4↓
b) 1. CaO + H2O → Ca(OH)2
2. Ca(OH)2 + MgCO3 → CaCO3 + Mg(OH)2
3. CaCO3 --to--➢ CaO + CO2
4. CaO + 2HCl → CaCl2 + H2O
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