This is an example of a common experiment used to classify material which should help you to understand how to work scientifically.
To classify some mystery substances as acids or bases.
Acids and alkalis are irritants. If they get onto your skin, rinse them off.
|Substance||Liquid||pH of liquid||Solid||Dissolve||pH of solution||Acid effect||Alkaline effect|
|A||Yes||7||No change||No change|
|B||No||Yes||Yes||3||No change||Neutralises alkali|
|C||No||Yes||No||Neutralises acid||No change|
|D||Yes||2||No change||Neutralises alkali|
|E||No||Yes||Yes||12||Neutralises acid||No change|
|F||Yes||13||Neutralises acid||No change|
Substance A is neutral and has no effect on acids or alkalis. B is a soluble acid, so it could be a non-metal oxide. C is an insoluble base because it neutralises an acid, so it might be a metal-oxide. D is an acid solution. E is a soluble base, so it dissolves to make an alkali. F is also an alkali.