Acids, alkalis and salts

4.1       describe  the  use  of  the  indicators  litmus,  phenolphthalein  and  methyl  orange  to distinguish between acidic and alkaline solutions

Litmus can be used as paper or solution. The others are used as solutions.

Indicator	Alkali	Neutral	Acidic
blue litmus	blue	blue	red
red litmus	blue	red	red
methyl orange	yellow	orange	red
phenolphthalein	pink	colourless	colourless