Neutral Substances

Neutral Substances are substances which do not exhibit cither an acid or an alkaline reaction. Thus acids change the colour of litmus from blue to red, while alkalis have a reverse action, and a neutral substance has no action upon either red or blue litmus. If an alkali be added to an acid, the properties of the acid are neutralised, and eventually the solution becomes neutral and contains a neutral salt. The quantities of acid and alkali then used are said to be equivalent to one another.