Re: [APD] How to make a good KH reference stock solution for CO2

[Vaughn Hopkins <hoppycalif at yahoo_com>]

Greg, it isn't that we need a specific KH as much as it is that we  
need a KH that is "pure" coming only from carbonates or bicarbonates,  
and with nothing else in the water to affect either KH or pH except  
for CO2.  Any buffered solution would not meet that criteria, plus it  
would cost 10X or more than a homemade KH solution of any accuracy at  
all.

Don't forget the pleasure that comes from playing chemist, too.   
Imagine how good it will feel to measure 98.73 grams of something and  
know that you have 98.73 grams and not 98.75 grams.  And, if you have  
a good graduate for measuring liquid volume, you just look extremely  
cool as you hold that up and sight across the scale on the side.    
Now, you just need an admiring audience.

I bought my scale on ebay this afternoon - 100 grams +/- .01 grams.   
And only $22.90 total (accurate to +/-$.01).  Now to search out a  
graduate for measuring a half liter+/-.01ml).  Now, aren't you  
anxious to be able to trot out those +/-.01's too?

Vaughn

On Dec 14, 2006, at 4:54 PM, Greg Fiske wrote:

> There isn't anything that is commercially available that we could  
> use? I mean do the pH calibration packets we use have an accurate KH?
>
> "Formulation Hanna pH buffers are made of Potassium Dihydrogen  
> Phosphate and Disodium Hydrogen Phosphate and are standardized with  
> a pH meter that is calibrated to NIST primary standard buffer  
> solutions (NIST 186Ie & 186IIe and NIST 158g S.R.M.). "
>
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