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Chemistry 7 Online
OpenStudy (anonymous):

A 1.00 L buffer solution is 0.150 M in HC7H5O2 and 0.250 M in LiC7H5O2. Calculate the pH of the solution after the addition of 100.0 mL of 1.00 M HCl. The Ka for HC7H5O2 is 6.5 × 10-5.

OpenStudy (jfraser):

use the concentrations of the acid and its conjugate in the henderson-hasselbach equation to find the starting pH, then use an ICE table to solve for the new concentrations when the strong acid is added. this is a 3 or 4 step process

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