Sulfate-reducing bacteria grow only in the absence of O2, and have caused signif

Question

Sulfate-reducing bacteria grow only in the absence of O2, and have caused significant economic damage because of their ability to corrode iron and steel pipes. However, they can be harnessed for the forces of good, because they can also reduce toxic metals like uranium and chromium, and prevent them from leaching into water supplies. The bacteria gain energy by oxidizing lactate to pyruvate, and sulfate (SO42-) serves as the terminal electron accepter, being reduced to sulfite (SO32-). The half-reaction for sulfate reduction is

Use this information as well as information that you draw from Table 13-7 in the textbook to calculate the standard change in reduction potential when lactate oxidation is linked to sulfate reduction. Enter your answer in units of volts.

In the balanced equation for the spontaneous reaction that occurs when sulfate-reducing bacteria are growing under the conditions described above, which compounds are the reactants?

(3) SO42-

(4) SO32-

In the balanced reaction for the spontaneous reaction that occurs when sulfate-reducing bacteria are growing under the conditions described above, which compounds are the products?

(3) SO42-

(4) SO32-

Explanation / Answer

In the balanced reaction for the spontaneous reaction that occurs when sulfate-reducing bacteria are growing under the condition described above, lactate and SO42- are reactants.

In the balanced reaction for the spontaneous reaction that occurs when sulfate reducing bacteria are growing under the condition described above ,pyruvate and SO32- are products.

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