The pH of a solution ranges from 0 to 14 An acid has a pH le

The pH of a solution ranges from 0 to 14. An acid has a pH less than 7. Pure water is neutral and has a pH of 7.
The pH of a solution is given by pH = - log x where x represents the concentration of the hydrogen ions in the
solution in moles per liter. Find the hydrogen ion concentration if the pH = 2.4.

a. 2.51 × 10-2
b. 3.98 × 10-3
c. 2.51 × 10-3
d. 3.98 × 10-2

Solution

[H+] is the hydrogen ion concentration

now you have pH = -log[H+] this is for you to find pH from [H+] to do it the other way around it\'s

[H+] = 10^(-pH)
[H+] = 10^-2.4
[H+] = 0.00398 M = 3.98 x 10^-3 M (option b) is correct)