Question

Pure water has a pH of 7. Pure water _______.

Answer 1

Answer:

The concentration of Hydrogen Cation is:

Pure water is NEUTRAL

Explanation:

pH = It is negative logarithm of activity of Hydrogen ions.

$pH = - log(a_{[H^{+}]})$

Activity = concentration for dilute solutions

There are three types of solution based on pH:

1. Acidic solution : Those solution which have pH between 0 to 7 or less than 7 are acidic in nature . They turns blue litmus red.They contain more H+ ions than OH- ions

2. Basic : Those solution which have pH value greater that 7 of between 7 to 14 are basic in nature . They turn red litmus blue.They contain more OH- ions then H+ ions

3 . Neutral : Those solution which have pH = 7 are neutral . They are neither acidic nor basic in nature .They have equa;l concentration of H+ and OH- ions in the solution.

The given water has pH = 7 .This means it is neutral and has low H+ ion concentration  in solution. The H+ ion are :

$10^{-7}$M in  water.

OH- =

$10^{-7}$M in water

So overall neutral