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I need a bit of help with solving a hydronium ion concentration problem.
I need to find the ion concentration of a solution that's 1.5 molar acetic acid and .20 molar sodium acetate.

If possible, could you explain how you got this answer so I can understand a bit better about how you came to this conclusion. Thanks.

2007-12-24 12:37:34 · 2 answers · asked by Anonymous in Science & Mathematics Chemistry

2 answers

Hydronium ion (H3O+) is sometimes better shortened to hydrogen ion (H+). Let acetic acid be abbreviated HOAc. Let acetate ion be abbreviated OAc-.

HOAc <===> H+ + OAc-

Ka = [H+][OAc-]/[HOAc] = 1.85 x 10^-5

The problem is to find [H+]. We know [HOAc], because that's 1.5M. It's true that a certain amount of the 1.5M ionizes, but it's so small that we can say that [HOAc] = 1.5M. Also, [OAc-] from ionization of HOAc is so small, that it is swamped by the 0.20M NaOAc that was added. So [OAc-] = 0.20M. Then:

Ka = [H+](0.20)/(1.5) = 1.85 x 10^-5

[H+] = (1.5)(1.85x10^-5)/(0.20) = 1.4 x 10^-4M to ywo significant figures

2007-12-24 13:13:58 · answer #1 · answered by steve_geo1 7 · 1 0

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RE:
Hydronium Ion Concentration?
I need a bit of help with solving a hydronium ion concentration problem.
I need to find the ion concentration of a solution that's 1.5 molar acetic acid and .20 molar sodium acetate.

If possible, could you explain how you got this answer so I can understand a bit better about how you came...

2015-08-16 22:17:41 · answer #2 · answered by Anonymous · 0 0

pH = -log [H3O+] You have the pH, all you have to do is calcualte [H3O+] from the formula above...

2016-03-13 16:31:04 · answer #3 · answered by Anonymous · 0 0

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