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Re: [APD] Interesting idea
Thanks for the update. Good to be able to cite a reference. I'll put int into the files, although, of course, as Paul noted previoulsly, we're getting a bit over the edge with precision. ;-)
Water in a bucket is the color of money because it costs you to have water sitting there idle, doing no work.
sh
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The aquatic plant convention is coming in November:
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----- Original Message ----
From: Jerry Smith <jerrytheplater at hotmail_com>
To: aquatic-plants at actwin_com
Sent: Wednesday, October 18, 2006 3:33:30 PM
Subject: Re: [APD] Interesting idea
Scott:
I searched for a reference to Paul Sears values you listed below. I found a
chart in Lange's Handbook of Chemistry, 14th Ed. 1992. McGraw-Hill. Table
8.9 "Selected Equilibrium Constants in Aqueous Solutions at Various
Temperatures". I will put the Table Values next to the ones Paul Sears used.
It looks like he rounded them off to two places. It also appears there is a
mistake at 15 C. I don't know who is wrong.
By the way, what color is the water in a white bucket on a cloudy day?
Jerry Smith, Bloomingdale, NJ
>
>Basically, the pka varies by temp according to:
Sears Values: Lange's Values:
>0 6.580 6.577 5 6.520 6.517
>10 6.470 6.465
>15 6.420 6.429
>17 6.410
>18 6.400
>19 6.390 20 6.380 6.382
>22 6.370
>23 6.365
>23.5 6.360
>24 6.355
>25 6.350 6.352
>26 6.345
>26.6 6.340
>27 6.338
>28 6.333
>29 6.332
>30 6.330 6.327
>
>where the left column is degress C and the right column is pka.
>Btw, the pka values I stated previously came from Paul Sears, who in turn
>looked it up in a reference (he doesn't says which reference, but I trust
>Paul on this).
>
>sh
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