Topic: pH measurd higher with KCl than CaCl2 solution (Read 3777 times)

carnation · « **on:** April 19, 2012, 05:53:51 PM »

Is there any reason why pH measured in KCl 1M is higher than in CaCl2 0.01M?
Thanks.

Borek · « **Reply #1 on:** April 19, 2012, 06:32:57 PM »

Different for sure, as there is a huge difference in ionic strength. Whether it should be higher or lower is not clear to me, as 1M is a rather concentrated solution, well past the applicability of the Debye-Huckel theory, even well past the range for Davies equation.

AWK · « **Reply #2 on:** April 20, 2012, 03:51:20 AM »

With 1 M KCl pH will be about 0.1 pH unit higher than in 0.01 CaCl₂

carnation · « **Reply #3 on:** April 20, 2012, 04:00:45 AM »

Thanks for you reply. I know that it different for sure because of different in ionic strength in different solution. The point here is in most articles, they found that you will have the lower result in KCl 1M compared to CaCl2 0.01M with the same solution. Because the more amount of electrolyte in your solution, the more H+ will be liberated to the solution.

Topic: pH measurd higher with KCl than CaCl2 solution (Read 3777 times)

carnation

pH measurd higher with KCl than CaCl2 solution

Borek

Re: pH measurd higher with KCl than CaCl2 solution

AWK

Re: pH measurd higher with KCl than CaCl2 solution

carnation

Re: pH measurd higher with KCl than CaCl2 solution

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