Question

The pH of a solution is a measure of its acidity or alkalinity. Specifically, pH = -log[H+] where [H+] is the hydrogen ion concentration in moles per liter. A solution with a pH less than 7 is an acid, one with a pH greater than 7 is a base (alkaline) and a pH of 7 is regarded as neutral.

a. The hydrogen ion concentration of pure water is [H+] = 10^-7. Find its pH.

Answer 1

To find the pH of a solution, we use a formula that relates pH to the hydrogen ion concentration. The pH measures how acidic or basic a solution is. When the pH is less than 7, the solution is acidic, when it is greater than 7, the solution is basic (alkaline), and a pH of 7 indicates neutrality. Now, let's calculate the pH of pure water, where the hydrogen ion concentration ([H+]) is 10^-7 moles per liter.

`pH=-log[H+]`

ph = potential of hydrogen

H+ = concentration of hydrogen ions

`pH=-log(10^-^7)`

`pH =7`

Answer: The pH of the pure water is 7.