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QUESTION

# Is H2S a lewis acid or a lewis base?

"H"_2"S" is usually a Lewis acid, but it can also act as a Lewis base.

"H"_2"S" is a weak acid.

"H"_2"O:" + "H"_2"S" ⇌ "H"_3"O"^+ + "SH"^-

"H"_2"S" is a Brønsted acid, because it is donating a proton to the water.

It is also a Lewis acid, because it is accepting a pair of electrons to form the "O-H" bond in hydronium ion.

"H"_2"S" has two lone pairs on the "S", so it can also act as a Lewis base.

In the presence of a strong acid like "H"_2"SO"_4, the "H"_2"S" becomes protonated.

"H"_2"S:" + "H"_2"SO"_4 → "H"_3"S"^+ + "HSO"_4^-

Here the "H"_2"S" is donating an electron pair to form a bond to the "H" of "H"_2"SO"_4, so it is acting as a Lewis base.