When sulfuric acid (h2so4) loses its hydrogen in exchange for calcium it becomes a CaSO4.
Chemical equation:
Ca (OH)2 + H2SO4 ⇒ CaSO4 + 2H2O
Explantion:
When sulphoric acid reacts with calcium hydroxide, it give the two protons while calcium hydroxide accept two proton resulting formation of CaSO4 and water.
