pH Scale

These type of scales are used to determine whether the chemical substance is an acid or a base using a colour indicator and to measure how acidic or basic the substance is. A pH of 7 is neutral on the scale, greater than 7 is a base and less than 7 is an acid. Strong acids are mostly ranged at a pH of 0-2, strong bases have a range at a pH of 12-14.

Colour Indicators

Colour Indicators are used to determine how acidic, basic or neutral the solution is. This method is told by the changing colour of the substance and using the pH scale to determine whether it is weak, strong or neutral.
Types of Indicators:
 - Universal Indicator
 - Red Cabbage Juice Indicator
 - Nitramine Indicator
 - Litimus Paper Indicator