Arrhenius acid-base reaction example showing H₂SO₄ reacting with Ca(OH)₂ to form water and calcium sulfate, with handwritten annotations highlighting the H⁺ and OH⁻ ions.
Example of an Arrhenius acid-base reaction question with options A, B, C, and D, where option C is circled and marked correct, showing the reaction H₂SO₄ + Ca(OH)₂ → 2H₂O + CaSO₄, with handwritten notes explaining the H⁺ and OH⁻ ions involved.