Question

How do you calculate the pH of a weak acid?

Answer 1

Hint: To calculate the pH of a weak acid, we should go through the whole concept of finding the pH. We have to compare the difference between the finding of pH of both weak and strong acid.

Complete answer:
Calculating the pH of a weak acid is a bit more complicated than determining the pH of a strong acid because weak acids don't completely dissociate in water.
Finding the pH of a weak acid is a bit more complicated than finding pH of a strong acid because the acid does not fully dissociate into its ions. The pH equation is still the same $ \left( {pH = - log\left[ {{H^ + }} \right]} \right) $ , but we need to use the acid dissociation constant $ \left( {{K_a}} \right) $ to find $ \left[ {{H^ + }} \right] $ .
There are two primary strategies for tackling hydrogen particle fixation. One includes the quadratic condition. The other accepts the feeble corrosive scarcely separates in water and approximates the pH. Which one we pick relies upon how exact we need the response to be.

Note:
The procedure for calculating the pH of a solution of a weak base is similar to that of the weak acid in the sample problem. However, the variable $ x $ will represent the concentration of the hydroxide ion.