Question

define ph scale draw a figure showing variation of ph changing in concentration

Answer 1

Ph scale is a type of indicator which has colour variaions on it which indicates whether a substance is acidic or basic.

Answer 2

PH SCALE - A measure of acidity or alkalinity of water soluble substances (pH stands for 'potential of Hydrogen'). A pH value is a number from 1 to 14, with 7 as the middle (neutral) point. Values below 7 indicate acidity which increases as the number decreases, 1 being the most acidic.

Hope it will help you friend :)