Calculating the [H+] and pH of a lactic acid solution

[biochemstuden]

How do I calculate the [H+] fo a 0.05 M lactic acid solution. The Ka of the lactic acid is
1.39 X 10-4



is this a henderson - hasselbalch equation?

 

[Borek]

Somehow I feel like I have already answered this question somewhere else...

You have to decide whether you are orgostudent or biochemstudent

 

[biochemstuden]

both :)

thanks!