Equation is as follow,
H₂SO₄ + NH₃ → HSO₄⁻ + NH₄⁺
H₂SO₄ goes to HSO₄⁻:
a) H₂SO₄ has lost one proton.
b) It is a Brønsted -Lowery acid as it has donated H⁺.
NH₃ goes to NH₄⁺:
a) NH₃ has gained proton.
b) It is a Brønsted -Lowery base as it has accepted proton.