Balance the following oxidation reduction reaction under acidic conditions. Show your work. MnO4− + H2SO3→ SO4...

Balance the following oxidation reduction reaction under acidic conditions. Show your work. MnO4− + H2SO3→ SO4 2− + Mn2+

Expert Solution

reduction :

MnO4- ----------------------------> Mn+2

(+7) (+2)

total 5 electrons are transfered

MnO4- +5e- ----------------------------> Mn+2

balance oxygens :

MnO4- + 8 H+ + 5e- ----------------------------> Mn+2 + 4H2O (equation 1)

oxidation :

H2SO3 -------------------------> SO4^-2

(+4) (+6)

two electrons are transfered

H2SO3 + 2e- -------------------------> SO4^-2

balance oxygens

H2SO3 + H2O + 2e- -------------------------> SO4^-2 + 4H+ (equation 2)

multiply equation (1) with 2 and multiply equation (2) with 5 and than add

2MnO4- + 16 H+ + 5H2SO3 + 5H2O ------------------> 2Mn+2 + 8H2O + 20 H+ + 5 SO4^-2

2MnO4- + 5H2SO3 + ------------------> 2Mn+2 + 3H2O + 4 H+ + 5 SO4^-2

queen_honey_blossom answered 1 year ago

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