S+H2=H2S
S{0} + 2e- = S{2-}. | 1
H2{0} - 2e- = 2H{+} | 1
2Na{+} + SO4{2-} + Ba{2+} + 2NO3{-} = =2Na{+} + 2NO3{-} + BaSO4↓
Ba{2+} + SO4{2-} = BaSO4↓
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S+H2=H2S
S{0} + 2e- = S{2-}. | 1
H2{0} - 2e- = 2H{+} | 1
2Na{+} + SO4{2-} + Ba{2+} + 2NO3{-} = =2Na{+} + 2NO3{-} + BaSO4↓
Ba{2+} + SO4{2-} = BaSO4↓