Đáp án:
Giải thích các bước giải:
3.
`2NaCl + 2H_2O \overset{đpdd,\ cmn}\to 2NaOH + Cl_2\uparrow + H_2\uparrow`
`3Cl_2 + 6KOH \to 5KCl + KClO_3 + 3H_2O`
`2KClO_3 \overset{t^o}\to 2KCl + 3O_2\uparrow`
`2KCl + 2H_2O \overset{đpdd,\ cmn}\to 2KOH + Cl_2\uparrow + H_2\uparrow`
`2KOH + MgCl_2 \to Mg(OH)_2\downarrow + 2KCl`
`Mg(OH)_2 + 2HCl \to MgCl_2 + 2H_2O`
4.
`1. 2NaCl + H_2SO_4 \to Na_2SO_4 + 2HCl`
`2. 2HCl \overset{đpdd}\to H_2\uparrow + Cl_2\uparrow`
`3. Cl_2 + 2KBr \to 2KCl + Br_2`
`4. Br_2 + 2HI \to 2HBr + I_2`
`5. I_2 + H_2\overset{t^o,\ xt}\to 2HI`
`6. 2HCl + Na_2CO_3 \to 2NaCl + CO_2\uparrow + H_2O`
`7. 2HCl + Na_2SO_3 \to 2NaCl + SO_2\uparrow + H_2O`
