The Effect of Acid on the Neutralisation Point

The Effect of Acid on the Neutralisation Point

Aim to find how the concentration of acid affects the neutralisation

point between acid and alkali.

Preliminary work in my preliminary work my aim was to find out which

indicator would give the best results in my neutralisation experiment

to do this we used three different indicators and worked out which one

gave us the result closest to the neutralisation point. We found that

universal indicator gave us the most varied results and was the

closest to the neutralisation point.

Prediction I predict that the higher the concentration of the acid the

more alkali will be needed to neutralise the acid.

Hypothesis an equal amount of the same strength acid and alkali will

neutralise each other, so if there is 100ml of 1 mole acid and 100ml

of 1 mole alkali mixed together the solution would become neutral.

Variables the variables are:

The strength of the acid.

This will affect the amount of alkali needed to neutralise the acid,

the stronger the acid the more alkali will be needed.

The strength of the alkali.

This will affect the amount of alkali that will be needed to

neutralise the acid. If the alkali has a concentration of 2 mole and

the acid has a concentration of 1 mole only half the amount of alkali

would be needed to neutralise the acid.

The amount of the acid.

The more acid there is the more alkali will be needed to neutralise

it.

This is because the volume of acid has increased therefore the volume

of alkali needed to neutralise it will need to increase.

I have chosen to use universal indicator as this gave me the best

results in my preliminary work. I am using an acid with a

concentration of 2 mole

and an alkali with the strength of 1 mole, this means that it should

take 40ml of alkali to neutralise 20ml of acid. I am using these

different strengths of acid to get a varied set of results.