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Verified answer
MnO4^- + 4H+ + 3e => MnO2 + 2H2O. x 2SO3^2- + H2O => SO4^2- + 2H+ + 2e. x3
total reaksi
2MnO4 ^- + 2H+ + 3SO3^2- => 2MnO2 + H2O + 3SO4^2-