The ph of a 0.30 m solution of a weak acid is 2.67. what is the ka for this acid?

Explanation:

Since it is a weak acid it is necessary to write the balance. Where the unknown acid will be HA.

.

Then with the equilibrium we can write the ICE table (figure 1).

Where we obtain the equation:

Now, we have to find "X". To do this we can use the pH equation and the pH value:

Then we have to plug the values in the Ka equation:

c. 75.7

i think that is the right

56 moles of   lieter in chemistry