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When calculating the pH of a buffer solution containing a weak acid/base and its salt, we are making the assumption that the initial concentrations of the acid/base and its respective ion (which is supplied initially by the salt) does not change. This means we are assuming that protonation and deprotonation are not occurring in the solution, even though it does to a small extent (for instance, CH3COOH protonates in a solution for about 1% of its molecules, but we are assuming this does not occur in our buffers to simplify the calculation).
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