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Author Topic: calculating molarity from pH  (Read 7984 times)

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madscientist

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calculating molarity from pH
« on: April 24, 2005, 04:54:58 PM »

how do i get the molarity from pH?
the only quantative info i have to work with is: 75.0mL
(0.075 L) solution of "HCl", with a pH of 1.56.

my working is: [H+] = 10-pH = 10-1.56 = 2.75x10^-2M\L

But the question states: "From it's pH, calculate the molarity of HCl".

have I done this with my working or have I just gotten the hydrogen ion concentration ?

Any help or just a point in the right direction would be much appreciated.
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AWK

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Re:calculating molarity from pH
« Reply #1 on: April 24, 2005, 08:10:23 PM »

For strong acids a concentrationacid and the concentration of H+ are the same.
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Borek

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Re:calculating molarity from pH
« Reply #2 on: April 24, 2005, 11:54:13 PM »

For strong monoprotic acids, to be precise ;)
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madscientist

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Re:calculating molarity from pH
« Reply #3 on: April 25, 2005, 03:40:06 PM »

 Thanks alot for the quick response!!

hopefully i can return tha favour one day
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