Question

define universal indicator for what purpose it is used and also define what is neutral substance

Please please answer fast

Answer 1

universal indicator is a blend of pH indicator solutions designed to identify pH of a solution over a wide range of values. There are several different formulas for universal indicators, but most are based on a patented formula developed in 1933 by Yamada. A common mixture includes thymol blue, methyl red, bromothymol blue, and phenolphthalein.

Color change is used to identify pH values. The most common universal indicator colors are:

Red 0 ≥ pH ≥ 3

Yellow 3 ≥ pH ≥ 6

Green pH = 7

Blue 8 ≥ pH ≥ 11

Purple 11 ≥ pH ≥ 14

neutral substance are those substance whose pH is 7 and show green color onnpH paper.for example water

Answer 2

universal indicator is a mixture of indicators which shows different colors for different ph value