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In pure water at 25°C, the concentration of H3O+ ions is **1.0 x 10^-7 mol/L**. This is because pure water is neutral, and the concentration of H3O+ ions is equal to the concentration of OH- ions, both of which are 1.0 x 10^-7 mol/L.
Therefore, the correct option is:
**A. 1.0 x 10^-7 mol/L**