Talk:Zinc chloride
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Article Grading: The following comments were left by the quality and importance raters: (edit · refresh) The following suggestions were generated by a semi-automatic javascript program, and might not be applicable for the article in question.
You may wish to browse through User:AndyZ/Suggestions for further ideas. Thanks, Wim van Dorst (Talk) 09:05, 21 March 2007 (UTC) |
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This page has been selected for the release version of Wikipedia and rated B-Class on the assessment scale. It is in the category Natsci. |
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Zinc chloride was a good article candidate, but did not meet the good article criteria at the time. Once the objections listed below are addressed, the article can be renominated. You may also seek a review of the decision if you feel there was a mistake.
Date of review: 2007-03-20 |
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[edit] Solubility
Is zinc chloride really THIS soluble? Adding 432 grams of dry powder in 100 grams of water, and still say that it dissolves? Wim van Dorst July 8, 2005 19:43 (UTC).
- Yes, true, according to the Merck Index and the CRC Handbook. If I get a chance I will check this, but I seem to recall reading something like, "Zinc chloride has the remarkable ability to dissolve in only ...." The solubility in boiling water is even more remarkable, 614g per 100g H2O! And ZnBr2 has similar solubility. Walkerma 19:50, 11 July 2005 (UTC)
[edit] Solubility
I have tried to dissolve 100g in 1 L of H20 at 25 deg C. It doesn't work. I ought to have a pH 5 solution according to the MSDS, but I have a pH 5.5 solution and I estimate just under half the ZnCl2 remaining undissolved. Sigma-Aldrich have suggested lowering the pH of my solution, but I'm convinced the pH of the water wasn't a factor. I'm hoping Chemistry is wrong, and I'm right; so if anyone else would like to check this for themselves...
- I went and tested this for myself, I took of zinc chloride from the stockroom, and at 29 °C (it's hot here today!) I got just over 20 g of it to go into 5.0 mL. Our stuff is not dry, as you can see from the picture, but it did give out a significant amount of heat as it dissolved so it's not totally hydrated away either.
- I wonder if your problem is related to the fact that ZnCl2 can hydrolyse. This problem is more often seen with tin(II) chloride and bismuth(III) salts, you can see the description of this problem with SnCl2 here. In other words, you may have some zinc oxide or zinc oxychloride present as an insoluble material. You can (a) filter it off (I bet it's a lot less than half, too!) and use the part that's left or (b) add HCl to get it all to dissolve at (hopefully) pH 5, or (c) buy a fresh bottle. Let us know what you find, please! Walkerma 20:40, 13 September 2005 (UTC)
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- I have added HCl and I have dissolved all the Zinc Chloride. The pH is approximately 5, I think a little insoluble material is still present but that won't matter for what I need it for. Thanks for your help. Karl. 15/09/05.
As an aside, does anybody know why we can't make a 10% solution of zinc chloride using de-ionised water, but we can make a 50% solution using distilled water? Thanks, Karl. 21/09/05.
- Have you checked the quality of the deionised water lately? That may indeed be the problem. After all, zinc carbonate is insoluble! For my tests I used distilled water. Cheers, Walkerma 15:49, 21 September 2005 (UTC)
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- I haven't checked our deionised water, but I also had to make up a calcium chloride solution. I used distilled but just out of interest I made up a small amount with deionised and the solution formed a precipitate, which I'm guessing is calcium carbonate. Karl 22/09/05.
[edit] Errors
This makes no sense (a mix of topics) and has no citations: "Typically this flux was prepared by dissolving zinc foil in dilute hydrochloric acid until the liquid ceased to evolve hydrogen, for this reason such flux was known as killed spirits. because of its corrosive nature it is not a suitable flux for situations where any residue cannot be cleaned totally away, such as electronic work. This property also leads to its use in the manufacture of magnesia cements for dental fillings and certain mouthwashes as an active ingredient. "
- Yes, this was probably added by someone passing through who was familiar with the use. It seems plausible. Do you know anything about this topic, enough to rewrite it with a citation? Or should we just delete it? When I originally wrote the article, my source only stated that it was used as a flux - no details. Walkerma 20:59, 6 November 2006 (UTC)
[edit] Delisted GA
This article has been removed from the GA list due to a lack of in line citations. Tarret 18:14, 14 March 2007 (UTC)
[edit] Failed "good article" nomination
This article failed good article nomination. This is how the article, as of March 20, 2007, compares against the six good article criteria:
- 1. Well written?: The grammar and format is good. Unfortunately, it contains too many unexplained technical terms and jargon; a reader would not want to click on every single link to find out what the mentioned word means.
- 2. Factually accurate?: Inline citations are an issue. Although they are not absolutely required, they are helpful especially in areas with possibly dubious information.
- 3. Broad in coverage?: "Precautions" is just two short sentences and needs expansion.
- 4. Neutral point of view?: Follows NPOV.
- 5. Article stability? Stable.
- 6. Images?: Good.
When these issues are addressed, the article can be resubmitted for consideration. If you feel that this review is in error, feel free to take it to a GA review. Thank you for your work so far.
King of ♥ ♦ ♣ ♠ 19:49, 20 March 2007 (UTC)
- It is well written.
- a (prose):
b (structure): 
c (MoS): d (jargon): 
- a (prose):
- It is factually accurate and verifiable.
- a (references): b (inline citations): c (reliable): d (OR):
- a (references):
- It is broad in its coverage.
- a (major aspects): b (focused):
- a (major aspects):
- It follows the neutral point of view policy.
- a (fair representation): b (all significant views):
- a (fair representation):
- It is stable.
- It contains images, where possible, to illustrate the topic.
- a (tagged and captioned): b (lack of images does not in itself exclude GA): c (non-free images have fair use rationales):
- a (tagged and captioned):
- Overall:
- a Pass/Fail:
- a Pass/Fail:
King of ♥ ♦ ♣ ♠ 19:49, 20 March 2007 (UTC)
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