Question

Proper definition of Acid, Base, Universal indicator

Answer 1

Universal Indicator Definition :    Color change is used to identify pH values. The most common universal indicators are:

red 0 ≥ pH ≥ 3
yellow 3 ≥ pH ≥ 6
green 7
blue 8 ≥ pH ≥ 11
purple 11 ≥ pH ≥ 14

Acid:
 An acid is a substance which forms H+ ions as the only positive ion in aqueous solution.

base:
An alkali is a substance which forms OH- ions as the only negative ion in aqueous solution.
A base is an insoluble hydroxide.

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Answer 2

acid
A substance which dissolves in water to furnish Hydrogen ions as the only positively charged ions is called an acid.
Example
Hydrochloric acid
sulphuric acid
carbonic acid

Base
The substances which react with acids to form salt and water as the only products are called bases.
All oxides and hydroxides of metals are bases.
The name of a base is start with a metal and end with oxide or hydroxide.
Examples
sodium oxide
copper oxide
magnesium hydroxide
calcium hydroxide



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