What is the oxidation number of sulfur in an HSO4- ion?

1 Answer
Oct 26, 2015

Answer:

#S^"+6"#

Explanation:

Some knowledge in oxidation numbers and algebra is in order.

For H atom, the most common oxidation state is +1.
For O atom, the most common oxidation state is -2.

Substituting #HSO_4^-# with its oxidation state values we have:

#(+1) + x + [(-2) * (4)] = -1#, where #x# = unknown

#(+1) + x + (-8) = -1#

#x + (-7) = -1#

#x = -1 + (+7)#

#x = +6#

Therefore, the correct answer is #S^"+6"#