Giải thích các bước giải:
1. $5HCl+HClO_3\xrightarrow{t^o}3Cl_2↑+2H_2O$
2. $2Na+Cl_2\xrightarrow{t^o} 2NaCl$
3. $2Cl_2+2NaOH\xrightarrow{đpddcmn}2NaOH+Cl_2↑+H_2↑$
4. $H_2+Cl_2\xrightarrow{As}2HCl↑$
5. $2HCl\xrightarrow{đpdd }H_2↑+Cl_2↑$
6. `Cl_2+2NaOH→NaCl+NaClO+H_2O`
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