Question

what is acid and base?define

Answer 1

hiii,

ACID - an acid is a substance that has free replaceable hydrogen ions in it's aqueous solution

BASE - water soluble alkalis are called base

hope helps

Answer 2

Acid is a compound which when dissolved in water yields hydronium ions as the only positive charged ion
Base is a compound which when dissolved in water yields hydroxyl ion as the negative charged ion

Acid is sour and base is bitter