Buffers??? so confused!! thanks!

Question

define the following as they relate to titrations.

buffer:

Buffer Capacity:

pKa:

Answer 1

Buffer solution is a solution that keeps the pH same while adding acid or base.

Buffer capacity: is the maximum concentration that can keep the pH same. Found by the equation pH=pKa

pKa is a balanced constant of an acid. For example:

CH3COOH + H2O------->CH3COO- + H3O

Ka=[CH3COO-][H3O]/[CH3COOH]

pKa=-logKa

Answer 2

During the titration process and before the equivalent point is reached, some acid has been neutralized by the strong base, and the solution contains a weak acid and its salt. The solution acts as a buffer.