Neutralization 

Acid + Alkaline (base) = water and salt

Aim: To look at the pH Scale and neutralise acid and alkaline substances using Univeral Indicator.

Neutralisation Experiment.

Equipment:

• Universal Indicator

• 1 M HCl ( Hydrochloric Acid)

• 1 M NaOH (Sodium Hydroxide)

• 4 Test tubes

• Test tube rack

• 2 plastic pipettes

Method:

1. Take a test tube rack with 1 boiling tube at each end of the rack and 4 test tubes.

2. Half Fill the boiling tube at one end with Sodium Hydroxide.

3. Half fill the boiling tube at the other end with Hydrochloric acid.

4. Fill each test tube with 5 drops of Universal indicator.

5. Using the pipettes you will add drops of the acid or alkaline to the test tubes to make colours. DO NOT MIX UP THE PIPETTES

Challenge:

To use the acids and alkalines to make the colours of the pH Scale.

Out of the 6 test tubes you should have the order of Red, Orange, Yellow, Green, Blue, Violet.

Once you have completed this you need to take a photo of your test tube rack and upload it onto your blog.

Activity:

Make your own copy of the pH scale. On the paper provided make 14 boxes and colour them the correct colours according to the pH scale. Use your test tubes as a guide.

One end is alkaline, one end is acid and Neutral is in the middle at pH7.