Indicators are used in the form of solutions. The following are the four types of solutions
This is made up of a mixture is various indicators which work at different pH ranges, It indicates pH from 3 to 11, which means that it can be used for all ordinary and acid-alkali titration.
It is the easier way of showing the color changes and convenient too. It is known as litmus PhenolphthaleinIt is colorless in neutral and acidic solutions, but have a pink color in alkaline solutions. Methyl OrangeIt is red in acidic medium but yellow in alkaline medium. It is orange in neutral solutions.