Question

What is acid and base?
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Answer 1

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An acid is a substance that donates protons (in the Brønsted-Lowry definition) or accepts a pair of valence electrons to form a bond (in the Lewis definition).

A base is a substance that can accept protons or donate a pair of valence electrons to form a bond. Bases can be thought of as the chemical opposite of acids.

Answer 2

Answer:

An acid is any hydrogen-containing substance that is capable of donating a proton (hydrogen ion) to another substance.

A base is a molecule or ion able to accept a hydrogen ion from an acid. Acidic substances are usually identified by their sour taste.