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| | Preparation of Rochelle Salt (Potassium Sodium Tartrate) (Site not responding. Last check: 2007-10-12) |
 | | Unfortunately, what is sold there as "cream of tartar" frequently has been NOT potassium bitartrate, but rather a mixture of calcium sulfate (Plaster of Paris), monocalcium phosphate, fumaric acid, and corn starch. |
 | | If the sales person cannot guarantee that what they offer is potassium bitartrate, don't buy it, at least for this purpose. |
 | | This involves the reaction of cream of tartar (potassium bitartrate, KHC4H4O6) with sodium carbonate (Na2CO3) to produce Rochelle salt (potassium sodium tartrate, NaKC4H4O6). |
| www.erowid.org /archive/rhodium/chemistry/rochelle.html (481 words) |
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