I have 5 mol of a weak acid (HQ). when this is dissolved in water, 0.50 mol of H is formed. what is the concentration of H3O? I have an answer, but I'm not sure it's right.

Question

photon336 · Answer

concentration is in moles/liter

anonymous · Answer

so, would it be just .5 M H30?

photon336 · Answer

well, what i'm asking is what is the amount of water that your acid was dissolved in?

photon336 · Answer

BTW H+ and acidic water H3O+ are the same.

anonymous · Answer

Sorry! I forgot to mention that it is dissolved in 1 L of H20. I also know that H+ and H30+ mean the same.

photon336 · Answer

I should be 0.5 moles/liter

photon336 · Answer

it**

rushwr · Answer

@kels4153 
$$Concentration = \frac{ moles }{ volume }$$
We have to find the concentration but we know both moles of H^+ and the volume of it right? 
moles = 0.5 moles
volume = 1l= 1dm^3
therefore
$$H ^{+} concentration = \frac{ 0.5mol }{ 1L }= 0.5molL ^{-1}$$

anonymous · Answer

Got it. Thanks!