### Uzdevums:

3p.
Latvijā kā dzeramo ūdeni visbiežāk izmanto dziļurbumu ūdeni, kas satur dzelzs jonus. Ūdens sagatavošanas procesā notiek atdzelzošana. Izmantojot par oksidētāju $$\mathrm{KMnO_4}$$, notiek oksidēšanās-reducēšanās reakcija un veidojas nešķīstošs dzelzs savienojums.

Uzraksti elektronu bilances vienādojumus un izvieto koeficientus dotajā oksidēšanās-reducēšanās reakcijas shēmā! (Atbildēs pieraksti arī koeficientu 1!)

$\stackrel{+2}{\mathrm{Fe}}{\left(\stackrel{+1}{H}\stackrel{+4}{C}\stackrel{-2}{{O}_{3}}\right)}_{2}\phantom{\rule{0.147em}{0ex}}+\phantom{\rule{0.147em}{0ex}}\stackrel{+1}{K}\stackrel{+7}{\mathrm{Mn}}\stackrel{-2}{{O}_{4}}\phantom{\rule{0.147em}{0ex}}+\phantom{\rule{0.147em}{0ex}}{\stackrel{+1}{H}}_{2}\stackrel{-2}{O}\phantom{\rule{0.147em}{0ex}}\to \phantom{\rule{0.147em}{0ex}}\stackrel{+3}{\mathrm{Fe}}{\left(\stackrel{-2}{O}\stackrel{+1}{H}\right)}_{3}\phantom{\rule{0.147em}{0ex}}+\phantom{\rule{0.147em}{0ex}}\stackrel{+4}{\mathrm{Mn}}\stackrel{-2}{{O}_{2}}\phantom{\rule{0.147em}{0ex}}+\phantom{\rule{0.147em}{0ex}}\stackrel{+1}{K}\stackrel{+1}{H}\stackrel{+4}{C}\stackrel{-2}{{O}_{3}}\phantom{\rule{0.147em}{0ex}}+\phantom{\rule{0.147em}{0ex}}\stackrel{+1}{{H}_{2}}\stackrel{+4}{C}\stackrel{-2}{{O}_{3}}$

Atbilde:
$\stackrel{ii}{i}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}-i\phantom{\rule{0.147em}{0ex}}{e}^{-}\phantom{\rule{0.147em}{0ex}}\to \phantom{\rule{0.147em}{0ex}}\stackrel{ii}{i}$

$\stackrel{ii}{i}\phantom{\rule{0.147em}{0ex}}+\phantom{\rule{0.147em}{0ex}}i\phantom{\rule{0.147em}{0ex}}{e}^{-}\phantom{\rule{0.147em}{0ex}}\to \phantom{\rule{0.147em}{0ex}}\stackrel{ii}{i}$

$i\phantom{\rule{0.147em}{0ex}}\mathrm{Fe}{\left(\mathrm{HC}{O}_{3}\right)}_{2}\phantom{\rule{0.147em}{0ex}}+\phantom{\rule{0.147em}{0ex}}i\phantom{\rule{0.147em}{0ex}}\mathrm{KMn}{O}_{4}\phantom{\rule{0.147em}{0ex}}+\phantom{\rule{0.147em}{0ex}}i\phantom{\rule{0.147em}{0ex}}{H}_{2}O\phantom{\rule{0.147em}{0ex}}\to \phantom{\rule{0.147em}{0ex}}i\phantom{\rule{0.147em}{0ex}}\mathrm{Fe}{\left(\mathrm{OH}\right)}_{3}\phantom{\rule{0.147em}{0ex}}+\phantom{\rule{0.147em}{0ex}}i\phantom{\rule{0.147em}{0ex}}\mathrm{Mn}{O}_{2}\phantom{\rule{0.147em}{0ex}}+\phantom{\rule{0.147em}{0ex}}i\phantom{\rule{0.147em}{0ex}}\mathrm{KHC}{O}_{3}\phantom{\rule{0.147em}{0ex}}+\phantom{\rule{0.147em}{0ex}}i\phantom{\rule{0.147em}{0ex}}{H}_{2}C{O}_{3}$

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