Here are some results of solutions tested with universal indicator paper:
|Sulphuric acid||: Red|
|Metal polish||: Dark blue|
|Washing-up liquid||: Yellow|
|Milk of magnesia||: Light blue|
|Oven cleaner||: Purple|
|Car batter acid||: Pink|
Arrange the solutions in order of their increasing pH value (starting with the one with the lowest pH).
The solutions have been arranged below in the increasing order of their pH values.
Sulphuric acid (~ pH 1) < Car battery acid (~ pH 2) < Washing-up liquid (~ pH 5) < Milk of magnesia (~ pH 9) < Metal polish (~ pH 12) < Oven cleaner (~ pH 14)