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Topic: pH problem  (Read 2298 times)

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Offline eikosan

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pH problem
« on: October 24, 2010, 03:15:48 PM »
Hey everybody,
could you please help me with this problem?
-> Calculate pH of HCl solution in water ( c(HCl))= 10^ -10 mol/dm^3).

I'm really confused because it seems that the usual formula ph= -log c.. doesn't apply here.
Can anybody help me?
(And I apologize for my bad English.)
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Offline DemonicAcid

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Re: pH problem
« Reply #1 on: October 24, 2010, 03:50:34 PM »
State your concentration in terms of molarity (check what your units actually mean.) Find the concentration of H+ ions in solution (hint, its a strong acid.) You should be able to figure it out from there.
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Offline Borek

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Re: pH problem
« Reply #2 on: October 24, 2010, 04:28:26 PM »
Quote from: eikosan on October 24, 2010, 03:15:48 PM
I'm really confused because it seems that the usual formula ph= -log c.. doesn't apply here.

Yes it does, but you have to remember about solvent...
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