V Chemistry - Indicators and pH scale

The colours that different pH indicators go when added to either alkali or acid substances

colour of **litmus** **paper** in **acid**

red

colour of **litmus** **paper** in **alkali**

blue

colour of **phenolphthalein** in **acid**

colourless

colour of **phenolphthalein** in **alkali**

pink

colour of **methyl** **orange** in **acid**

red

colour of **methyl orange** in **alkali**

yellow