Why is a buffer solution used?

1 Answer
anor277
Feb 6, 2017

Why? Well to prevent GROSS changes in #pH#.

Explanation:

See this [old answer.](https://socratic.org/questions/how-do-buffers-maintain-ph)

#pH=pK_a+log_10{[[A^-]]/[[HA]]}#

This expression is derived in the link, along with some of the implications. When you do a titration of a weak acid, the POINT of half-equivalence, i.e. when #[HA]=[A^-]#, which may easily be interpolated from a graph, is the #pK_a# of the acid? Why?

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