Bigdaddyale
Well-Known Member
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Take some of the precipitate (filter it out through a paper towel) and drip vinegar on it. Does it fizz?
Damn I dumped it out already, if it fizzes does it mean calcium? I made the solution with Ball's pickle crisp first time. Then I thought maybe purity issues so I bought a 1lb of CaCl2 at the LHBS, LD Carlson was the name I believe, and it did the same thing.
Mine has this noticeable white precipitate also. I don't believe that the CaCl2 beads I bought at the LHBS are very pure. It's as if there is chalk in it. Fore sure it is something that is white and highly insoluble in water.
Could it be that the manufacturer is adding chalk (or something) as an anti-caking agent? Or worse, as a cutting agent to reduce their cost?
I presume that if it isn't dissolved, it also is not throwing the hydrometer SG reading off.
Next time I'm just going to buy Ball's product called "Pickle Crisp", which is far less expensive, and is likely no worse. Purely speculation here, but the company that supplies the LHBS's may be purchasing and re-packaging something similar for all I know. Come to think of it, I've never noticed a white precipitate in pickles processed with 'Pickle Crisp'.
I tried both and both did the same thing. It's clear as water for a few weeks then I noticed the white precipitate collecting at the bottom. I'll just go back to measuring dry if I can't prevent it. A pound of CaCl2 at the LHBS was better priced for me than the pickle crisp
My thinking is that it might be chalk formed when CO2 from the air dissolves in the solution. Were I correct in this thinking the precipitate would, of course, fizz when exposed to an acid (such as vinegar). I'm not too comfortable with this thesis as dissolved CO2 leads to carbonic acid with only very, very little carbonate resulting unless the pH were raised by something such as lime (Ca(OH)2) which is, often, a contaminant of calcium chloride. As a first check I'd take a new solution and check its pH. If it is high (and I have seen this) then that's indicative of the presence of Ca(OH)2 and the precipitate is quite likely CaCO3. If this is bothersome the fix would be to neutralize the solution to pH 7 with hydrochloric acid but I think I'd rely on Silver's observation that if it is lying on the bottom it isn't effecting the SG of the solution and so just recheck the SG of the solution and use that value to calculate the CaCl2 concentration.
The vinegar test produced a steady stream of gas bubbles when poured onto the precipitate.
Might the Ca(OH)2 contaminant present within the CaCl2 beads be of sufficient quantity to throw mash pH's noticeably off to the high side?
Is there any logical and/or justifiable reason for it to be there in the first place?
This certainly brings mash pH measurements into question, and since not accounted for, will throw a monkey wrench into the works when using software for mash pH. The software will inevitably take the blame, albeit unjustifiably.
Is there another source for CaCl2 beads that does not exhibit this irritating contamination?
You are not buying ACS grade from LD Carlson. It is presumably FCC. The specs for one supplier's FCC CaCl2.2H20 that I found in a net search promise alkalinity as less than 0.3% as Ca(OH)2. So apparently some level of alkalinity is allowed under the FCC regs for this chemical.i'm not happy at all with LD Carlson in regard to this matter. It makes me wonder about the quality of their other products.
No, it's fine. As just noted the alkalinity has been neutralized when the precipitate forms. Just check the SG of the supernatant to see if it has changes appreciably. Use the SG of the supernatant in the CaCl2 concentration calculation.I've only opened mine for the briefest of time periods, and only three times since making it, and the precipitate is pronounced. Should I toss it out and start over?
You can use any reasonable acid (no HFl please!) but it seems to me the easiest would be carbonic as that happens automatically anyway,I don't have any HCl. Can I use 88% lactic acid to neutralize my CaCl2 solution?
It is chalk and chalk contains calcium so you are not adding all the calcium you originally put into the mix. The amount you have lost to the precipitate is, however, insignificant based on the reports of undetectable decrease in SG.... I was not adding the calcium I thought I was. Of course now I'm reading it was more lime/chalk than calcium.
The reason I recommend HCl for the neutralization is, if you all haven't already figured this out, that the contaminant Ca(OH)2 gets converted to the desired CaCl2.
A refractometer works just fine for this purpose but you cannot use the Brix scale. You must reduce the Brix reading to a refractive index reading and then look up the calcium chloride concentration corresponding to that refractive index. You can find tables of Brix vs RI and CaCl2 concentration vs RI on line. From them you can obviously prepare a table of Brix reading vs CaCl2 concentration.
ajdelange, have you updated the baseline measurements from the main post here? Are you still recommending that everything still be halved as compared to what is currently posted?
That's my understanding. I've been a big fan of the primer for a year or so. The only time I get really aggressive with salts is for the NEIPA style. Martin has a nice neipa profile in the summer issue of Zymurgy. It made for a really nice Beer.
I have found that less is more with CaCL and Gypsum in most cases.
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