Решение:
SO2+H20=H2SO3
SO2+H20=2H(+)+SO4(2-)
<span>H2SO3 + 2NaOH=Na2SO3 + 2H2O</span>
<span>2H(+)+<u>SO3(2-)</u>+<u>2Na(+)</u>+2OH(-)=<u>2Na(+)</u>+<u>SO3(2-)</u>+2H2O
</span>
<span><span>2H(+)+<span>2OH(-)=<span>2H2O</span></span></span></span>
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</span></span></span></span>
<span><span><span><span>Na2SO3 </span></span>+MgCl2=2NaCl + MgSO3</span></span>
<span><span><span><u>2Na(+)</u>+SO3(2-)</span>+Mg(2+)+<u>2Cl(-)</u>=<u>2Na(+)</u>+<u>2Cl(-)</u>+<span><span> MgSO3</span></span></span></span>
<span><span><span><span><span><span><span>SO3(2-)</span>+Mg(2+)</span></span>=<span><span><span><span>MgSO3</span></span></span></span></span></span></span></span>