Talk:Calcium sulfate

From Wikipedia, the free encyclopedia

Chemicals WikiProject
Chemistry Portal
Calcium sulfate is within the scope of WikiProject Chemicals, a daughter project of WikiProject Chemistry, which aims to improve Wikipedia's coverage of chemicals. To participate, help improve this article or visit the project page for details on the project.

Article Grading: The article has not been rated for quality and/or importance yet. Please rate the article and then leave comments here to explain the ratings and/or to identify the strengths and weaknesses of the article..


From gypsum

A growing source of gypsum is from Flue gas desulfurization which scrubs the sulfur emissions from fossil fuel burning power stations. This is done by using finely ground limestone which reacts with the sulfur dioxide to produce high purity gypsum as a by-product. This is now the main source for calcium sulfate. Schould this be mentioned here? Stone 16:49, 2 February 2006 (UTC)

Contents

[edit] Density error?

This density (~22g/cm^3), about that of Ir, seems to me to be in error. Drywall doesn't strike me as that heavy. Should this be verified? --Oreo Priest 03:10, 10 August 2006 (UTC)

This value is correct (checked the Merck index). I should note though, that this is for the anhydrous form. The hydrated form which is in drywall has a density of 2.32g/cc. In addition, I think this would be the density of one solid crystal not of light powder which has a lot of free space between particles. Finally if you compare the value to magnesium sulfate (d 2.66), it seems to make sense. —Preceding unsigned comment added by 128.61.66.171 (talk) 06:47, 2 December 2007 (UTC)

[edit] Need to break up this article

The chaotic nature of the chembox data is because the article refers to multiple minerals. Suggest change this to a short disambiguation page, pointing to separate articles for each hydration state. This is justified because the different hydrates are all high-volume minerals with very different applications, etc. LinguisticDemographer 01:44, 11 February 2007 (UTC)

This will create sevaral stub articles with less use. Better would be to write a chapter about every of the compounds in this article.--Stone 09:17, 12 February 2007 (UTC)

Does this mean we can multiple databoxes in one article? LinguisticDemographer 16:17, 12 February 2007 (UTC) I think this might be possible.--Stone 16:57, 12 February 2007 (UTC)

[edit] Re-write production

Re-wrote section to refer to calcium sulfate rather than "gypsum", in chemist's language. Remove unsubstantiated (since 25 Jan 2007) and POV content. . . . LinguisticDemographer 19:19, 5 August 2007 (UTC)

[edit] Drierite mention added.

I've added a sentence on Drierite, as Drierite redirects to this article, but had no mention anywhere in the article. I'm of the belief that when a term is redirected, it should be mentioned somewhere in the target article. Otherwise, someone looking up info on blue/pink Drierite who reaches this article and sees CaSO4 is a white compound will be confused. I also took this opportunity to integrate the orphan sentence about the compound's color into the first paragraph. Kel - Ex-web.god 22:27, 10 October 2007 (UTC)

[edit] Qualitative analysis

How to differentiate between calcium sulfate and calcium hydroxide? They both have low solubility in water.--Tohyf (talk) 10:10, 30 November 2007 (UTC)

The hydroxide is a fairly strong base despite its low solubility. You could identify it using pH paper, for example. --Itub 10:43, 3 December 2007 (UTC)