Question

Why we need to use pH scale

Answer 1

Litmus can be used as a liquid, or as litmus paper. Solutions of acids and alkalis can vary widely in their acidity and alkalinity. It is useful to know not just whether a solution is an acid or an alkali, but how acidic or how alkaline it is. To measure acidity and alkalinity,we can use the pH scale.

Answer 2

we need pH scale to measure the the reaction aur solution is acid or base