The earliest and simplest definition of acids and bases was suggested by . He/They defined an acid as a substance with in its formula that dissociates in water to yield and a base as a substance with in its formula that dissociates in water to yield .

Arrhenius

H, H₃O⁺

OH, OH⁻

Explanation:

The earliest and simplest definition of acids and bases was suggested by Arrhenius. He/They defined an acid as a substance with hydrogen in its formula that dissociates in water to yield H₃O⁺ and a base as a substance with OH in its formula that dissociates in water to yield OH⁻.

Acid:

An acid is the substance that sour in taste and turns the color of litmus paper from blue to red.

pH of acid is less than seven.

Base:

An acid is the substance that bitter in taste and turns the color of litmus paper from red to blue.

The pH of base is 7-14.

Arrhenius gives the simplest definition of acid and base.

Arrhenius acid:

A substance that increase the concentration of hydronium ion in solution is called acid.

HNO₃       →       H⁺ + NO₃⁻

             (H₂O)

Arrhenius base:

A substance that increase the concentration of  OH⁻ ion in solution is called base.

KOH   →  K⁺ + OH⁻

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