Question

Define universal indicaters

Answer 1

Answer:

a mixture of dyes that changes colour gradually over a range of pH and is used (especially as indicator paper) in testing for acids and alkalis.

Explanation:

A universal indicator is a pH indicator made of a solution of several compounds that exhibits several smooth colour changes over a wide range pH values to indicate the acidity or alkalinity of solutions. ... Experiments with Yamada's universal indicator are also described in the Journal of Chemical Education.

For example, common indicators such as phenolphthalein, methyl red, and bromothymol blue are used to indicate pH ranges of about 8 to 10, 4.5 to 6, and 6 to 7.5 accordingly.

Answer 2

Explanation:

a substance that changes to different colours according to whether another substance that touches it is an acid or an alkali