Which chemical equation shows the dissociation of 2 protons from trihydrogen phosphate (phosphoric acid)?
A) H3PO4 → H2O + HPO4²⁻
B) H3PO4 → H2PO4⁻ + H⁺
C) H3PO4 → HPO4²⁻ + 2H⁺
D) H3PO4 → H2PO4⁻ + 2H2O