1. The problem statement, all variables and given/known data Which pairing is not a set of conjugates? A. OH1– and H2O B. HC2H3O2 and C2H3O21– C. HCl and Cl1– D. NH3 and NH41+ E. H2SO4 and SO42– 2. Relevant equations - 3. The attempt at a solution I couldn't choose because conjugates, from what I learnt, is basically an acid or a base and its equivalent with more or less protons. All of the pairs have protons as their only difference. The only special case is E with 2 proton difference, but I know H2SO4 is sulfuric acid and when it has donated its protons it will become SO42–. So it seems to me E would also be conjugate. However, the answer is E. Could someone explain to me why E is not a pair of conjugates?