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Topic: acids and bases.  (Read 7361 times)

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Offline Shea

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acids and bases.
« on: August 24, 2006, 06:17:52 PM »
What is the concentration of H+ and OH- in a 3.5 M solution of HCl?

I think the H+ is 3.5, but what next?
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Offline Borek

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Re: acids and bases.
« Reply #1 on: August 24, 2006, 06:22:44 PM »
Kw
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Offline Shea

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Re: acids and bases.
« Reply #2 on: August 24, 2006, 06:58:46 PM »
10-14 / 3.5 right?
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Offline Borek

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Re: acids and bases.
« Reply #3 on: August 25, 2006, 02:58:34 AM »
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Offline Shea

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Re: acids and bases.
« Reply #4 on: August 25, 2006, 06:22:46 PM »
What is the concentration of OH- in a 3M solution of NaOH?

How do you go from 3M to OH-?  Can someone explain the steps please?
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Offline Borek

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Re: acids and bases.
« Reply #5 on: August 25, 2006, 06:25:38 PM »
Directly. NaOH dissociates. Period.
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Offline Shea

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Re: acids and bases.
« Reply #6 on: August 25, 2006, 06:26:43 PM »
OH- = 3?
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Offline Shea

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Re: acids and bases.
« Reply #7 on: August 25, 2006, 06:30:04 PM »
By the way, what is the relationship between H+, OH-, and Ka??
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Offline Borek

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Re: acids and bases.
« Reply #8 on: August 25, 2006, 06:35:58 PM »
Check http://www.chembuddy.com/?left=pH-calculation&right=introduction-acid-base-equilibrium for Ka and Kw definition. There is no direct, universal relation between H+, OH-, and Ka.
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Offline Shea

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Re: acids and bases.
« Reply #9 on: August 25, 2006, 07:21:26 PM »
Then how would I solve this?

What is the pH of a 2M solution of uric acid, with Ka = 1.29 x 10-4.

HC5H3N4O3 <-> H+ + C5H3N4O3-
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Offline Shea

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Re: acids and bases.
« Reply #10 on: August 25, 2006, 07:36:30 PM »
Also, how would I tell if this is an acid/base and strong/weak??

C2H5NH2 + H2O <-> C2H5NH3+ + OH-
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Offline Borek

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Re: acids and bases.
« Reply #11 on: August 26, 2006, 03:25:30 AM »
Please read the pH calculation lectures I have pointed you to several times. They contain answers to all your questions already asked, and ones that I feel you will ask in the near future.
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