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Acids and Alkalis

Titration between an Acid and an Alkali.

What is a Titration?

A titration adds a carefully measured amount
of one solution to another.

To do a titration you need to use
a burette, pipette and a conical flask.
Click here for an example of a titration
of an acid with an alkali.
A titration is used to calculate the concentration of
another solution or to get a pure dry sample
of a soluble salt by allowing a solution to crystallise.

What is the End Point in a Titration
between an Acid and an Alkali?

In a titration an acid can be added drop by drop
to an alkaline solution.
The pH of the alkaline solution will decrease
as more acid is added.
When the pH goes down to 7 the solution is neutral.
This is called the end point.
If more acid is added to the solution after the end point
the pH will continue to go down and the solution becomes acidic.

The end point can be found by using one of the 4 methods below.

1)  Use an indicator.      2)  Use a pH meter.

3)  Measure the conductivity of the solution.

4)  Measure the amount of heat released into the solution.

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