# How is sulfate ion reduced to sulfide ion?

Feb 25, 2017

Do you mean $\text{sulfate to sulfide............?}$

#### Explanation:

Well, this is a formal reduction:

$\text{sulfate(+VI) undergoes 8 electron to S(-II)} :$

$S {O}_{4}^{2 -} + 8 {H}^{+} + 8 {e}^{-} \rightarrow {S}^{2 -} + 4 {H}_{2} O \left(l\right)$

I am no biochemist, but I believe this is achieved by bacterial action. Are charge and mass balanced?