I'll give 15 dozen cookies to the person who helps me solve this, i've been going at it forever now.

What is the percent dissociation of an acid which has a pH of 3.5 and a
concentration of 0. 15 mol/L?
lol wut

I actually just took my chem final today; not looking so good. Wish I could help.

Someone help this man with his chemistry!
watch Breaking Bad. That's how I studied for my chemistry final.
He's a freak of nature, but we love him so.

Quote by John Frusciante
Music isn't the Olympics. It's not about showing other people what you can do with a piece of wood in your hands that has strings on, it's about making sounds that are good.
I never learned how to do this, but I think I know enough to solve it.

pH=-log(H30 ions) right?

plug in pH and solve for H30 ions. Now we now that you get x ions from 0.15 M solution. Assuming the 100% of 0.15 moles dissolved find what the H30 concentration should be. Divide what it is by wht is should be and thats your answer.
I'll be your number one with a bullet.
unless they just say it's a strong acid (one of the 7) then it's 100%.
Otherwise acsticrckr89 has way to do it