Chemická reakce HBr a H2SO4
Vyčísli následující rovnici:
\( \textrm{HBr} + \textrm{H}_2\textrm{SO}_4 → \textrm{Br}_2+\textrm{H}_2\textrm{S} + \textrm{H}_2\textrm{O} \)
\( 8\ \textrm{HBr} + \textrm{H}_2\textrm{SO}_4 → 4\ \textrm{Br}_2+\textrm{H}_2\textrm{S} + 4\ \textrm{H}_2\textrm{O} \)
\( 10\ \textrm{HBr} + \textrm{H}_2\textrm{SO}_4 → 5\ \textrm{Br}_2+\textrm{H}_2\textrm{S} + 5\ \textrm{H}_2\textrm{O} \)
\( 6\ \textrm{HBr} + \textrm{H}_2\textrm{SO}_4 → 3\ \textrm{Br}_2+\textrm{H}_2\textrm{S} + 3\ \textrm{H}_2\textrm{O} \)
\( 4\ \textrm{HBr} + \textrm{H}_2\textrm{SO}_4 → 2\ \textrm{Br}_2+\textrm{H}_2\textrm{S} + 2\ \textrm{H}_2\textrm{O} \)
Urči si oxidační čísla prvků. Uvědom si, jestli jde o redoxní reakci. Pokud ano, použij k vyčíslení křížové pravidlo, pokud ne, tak musíš reakce vyčíslit tzv. „by voko“.
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