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Old 12-27-2011, 03:13 AM   #1
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Default How much Calcium Chloride is this?

One gram adds 72 ppm Ca, does this mean per gallon?




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Old 12-27-2011, 03:17 AM   #2
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That would be 1 gram CaCl2 = 72 ppm Ca per gallon.

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Old 12-27-2011, 03:19 AM   #3
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Right, the concentration level is per gallon.

You might find the table on this page handy...

Cheers!

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Old 12-27-2011, 03:22 AM   #4
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Ok, thanks, I thought I might be overthinking this, but I wanted to be sure.

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Old 12-27-2011, 03:24 AM   #5
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Originally Posted by Buna_Bere View Post
Ok, thanks, I thought I might be overthinking this, but I wanted to be sure.
In fairness to you, the folks at the Emporium could have come up with a more informative label...

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Old 12-28-2011, 12:53 AM   #6
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Well the label says it is CaCl2. If you put 1 gram of that in 1 gal of water you will get 95.4 ppm Ca++ and 168.9 mg/L Cl-. If, OTOH, you put 1 gram of the dihydrate (CaCl2.2H2O) in 1 gal of water you would get the numbers on the label. So either the CaCl2 labeling is wrong or the concentrations are wrong.

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Old 12-28-2011, 01:02 AM   #7
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Well the label says it is CaCl2. If you put 1 gram of that in 1 gal of water you will get 95.4 ppm Ca++ and 168.9 mg/L Cl-. If, OTOH, you put 1 gram of the dihydrate (CaCl2.2H2O) in 1 gal of water you would get the numbers on the label. So either the CaCl2 labeling is wrong or the concentrations are wrong.
haha, i just noticed that they didn't even get the formula of CaCl2 right... they call it calcium chloride, but then list it as CaCl.
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Old 12-28-2011, 05:11 AM   #8
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I didn't notice the missing 2!

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Old 12-28-2011, 10:15 PM   #9
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Quote:
Originally Posted by ajdelange View Post
Well the label says it is CaCl2. If you put 1 gram of that in 1 gal of water you will get 95.4 ppm Ca++ and 168.9 mg/L Cl-. If, OTOH, you put 1 gram of the dihydrate (CaCl2.2H2O) in 1 gal of water you would get the numbers on the label. So either the CaCl2 labeling is wrong or the concentrations are wrong.

Well you got me curious which kind it was, so I asked. Here's my email and the response.

Hi, I purchased a small container of Calcium Chloride from the Cambridge shop a couple of weeks ago, and I had a question about what kind of Calcium Chloride it actually is. Is it CaCl2 or is it the dihydrate CaCl2.2H20?

Thanks,
Bob


"I have no idea, but we sell two varieties, a dry one and a liquid one.
I assume the dry type is anhydrous and the liquid is the dihydrate."



So now my new question is since this is the dry one, does this mean I'm getting 95.4ppm Ca per gram?
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Old 12-28-2011, 11:52 PM   #10
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Afraid it isn't that simple. Calcium chloride, CaCl2.nH2O exists for n = 0,1,2,4, or 6 (those are all the one's I've heard of anyway). I have never been able to determine, short of assay and my assays haven't left me with warm tummy feelings, what n might be for stuff I buy from the LHBS. If I buy it from a chemical supply house and it says dihydrate on the label and its ACS grade then I'm confident that I'm getting CaCl2.2H2O. Otherwise I'm not. Most calcium chloride contains, for example, some calcium hydroxide and there is no reason, really, why n couldn't be a non integer number (implying that the product is a mix of more than one type). In my calculations I tend to use n=1 assuming that the actual is equally likely to be the anhydride or the dihydrate (for years I assumed it was the dihydrate until I started to look into it a little) and thus "splitting the difference".

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