Re: [APD] Interesting idea

["Jerry Smith" <jerrytheplater at hotmail_com>]

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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