Question

For a half-reaction in an acidic solution, which substances should you add to balance the equation?

A. H+ and H20
B. H+ and OH-
C. H20 and NO2
D. OH-

Answer 1

the answer to this question is A

Answer 2

Answer: A.
`H^+` and
`H_2O`

Explanation: If a redox reaction takes place in an acidic medium then oxygen is balanced by adding
`H_2O` and hydrogen is balanced by adding
`H^+` . If the reaction takes place in basic medium then we use
`OH^-` in place of
`H^+` .

Since, the question asks about balancing a half-reaction in an acidic medium,
`H_2O` and
`H^+` are added to balance the equation and hence the correct choice is A.