One desires to adjust a solution to ph 8.5 by the use of boric acid-sodium borate buffer
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Explanation:
Boric acid is a weak acid, with pKa (the pH at which buffering is strongest because the free acid and borate ion are in equal concentrations) of 9.24 in pure water at 25 °C. But apparent pKa is substantially lower in swimming pool or ocean waters because of interactions with various other molecules in solution.
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