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Topic: Finding hydroxide ion concentration from given ph.  (Read 4143 times)

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Offline el123

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Finding hydroxide ion concentration from given ph.
« on: April 12, 2010, 03:31:40 AM »
ok so if i have something with a pH of 1.9 and i am asked to find the concentration of H3O+ and OH-

im a little confused.

to find [H3O+] ==  >   [H3O+]= 10-1.9 = 0.0126M

so to find [OH-] = kw/[H3O+] = 10-14/0.0126  =7.937 x 10-13M

Is that how it is done? Please set me right.
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Offline UG

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Re: Finding hydroxide ion concentration from given ph.
« Reply #1 on: April 12, 2010, 03:48:05 AM »
You are correct
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Offline el123

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Re: Finding hydroxide ion concentration from given ph.
« Reply #2 on: April 12, 2010, 05:09:01 AM »
Thanks mate!
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