# Acid & Base titration curve

http://img19.imageshack.us/img19/2692/chptitration.jpg [Broken]

http://img130.imageshack.us/img130/6351/titrationfigure1.jpg [Broken]

1.)For the titration of strong acid and strong base, and at the beginning of the curve, how to explain the big amount of base added only increase a little of the pH value since it was not a buffer region.

2.)The line of point S or equivalence point is a straight line or steep/slope to left hand side ??

thanks~~

## The Attempt at a Solution

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The equivalence point occurs ideally when at an inflection point. That is when slope reaches a extremum (want $$\frac{d^2(pH)}{dV^2} = 0$$) - however I have found that rarely happens in real life - you want the point closest to where this is true.