pH is a number that is a property of a solution.
pH is related to the acidity or basicity of the solution.
pH may be measured using a pH meter or paper that contains a pH-sensitive indicator..
pH depends on which acids and which bases are present, and on their concentrations.
pH may be measured using a pH meter or paper that contains a pH-sensitive indicator..
pH depends on which acids and which bases are present, and on their concentrations.
Water is the reference compound for defining whether a solution is either acidic or basic.
Water is said to be pH neutral because it is neither acidic or basic.
The pH of pure water is 7.
The pH of pure water is 7.
Solutions classed as acidic have a lower pH than water.
The pH of acidic solutions is lower than 7.
Solutions classed as basic (or alkaline*) have a higher pH than water.
The pH of basic solutions is greater than 7.
*The substance that makes the pH higher than water is a base,
Solutions that have pH greater than 7 may also be referred to as alkaline.
This terminology has arisen because the hydroxides of the Alkali Metals (Group 1 in the periodic table) are amongst the most common bases.