Testing pH

 Aim: 

1. The aim is to test the pH of a range of household chemicals. 

Method: 

1. Add a few drops of each chemical to a spot on your spotting tile. if a substance is solid or powdered you will need to mix it with a few drops of water before testing it. 

2. Test the chemicals with litmus papers. 

3. Test each chemical with a few drops of universal indicator.

Results: 

Chemical being tested	Colour in blue litmus	Colour in red litmus	Colour in Universal indicator
Dish wash liquid	Blue weak base	Red strong acid	Neutral
Floor cleaner	Blue weak base	Blue weak base	Orange weak acid
Spray and wipe	Blue weak base	Blue weak base	Blue weak base
Vinegar	Red strong base	Red strong base	Red strong base

Discussion:

Conclusion: 

Chemical being tested	Acid or base	Evidence from investigation
Dish wash liquid	Neutral	The red and blue litmus stayed the same colour when we mixed.
Floor cleaner	Weak acid	Both red and blue litmus turned blue but when we mixed it with Universal it turned orange.
Spray and wipe	Weak base	Like the floor cleaner, they both turned blue but when we mixed it with universal it turned blue.
Vinegar	Strong acid	Unlike the other ones, this one was both red and when we mixed it with universal it turned yellow.