Question

what do mean by acid & base....?

Answer 1

according to Arrhenius
acids
acids r those substance which produce hydrogen ions(H+) in aqueous solution

base
base r those which produce hydroxide ions (OH-) in Aqueous solution

according to bronsted-lowry
Acids r those substance which can give protons to any other substance and bases r those substance which can accept protons from any other substance.



but in common language we can also define acid r those which r sour in taste while base r bitter in taste

hope dis help

Answer 2

Hi ..........

acid :An acid is a substance that donates hydrogen ions. Because of this, when an acid is dissolved in water, the balance between hydrogen ions and hydroxide ions is shifted. 

Base :Any substance that in water solution is slippery to the touch, tastes bitter, changes the colour of indicators reacts with acids to form salts, and promotes certain chemical reactions .  (e.g., turns red litmus paper blue)

hope it will help u .... :-)