INTRODUCTION
Potassium sodium tartrate commonly known as Rochelle salt, is a double salt of tartaric acid. It is a white crystalline solid that is highly soluble in water. This compound is well known for its piezoelectric properties and has been historically used in various scientific and industrial applications.
MANUFACTURE
The production of potassium sodium tartrate involves the reaction between tartaric acid, sodium carbonate (Na₂CO₃), and potassium carbonate (K₂CO₃).
| Synonyms | Potassium sodium tartrate tetrahydrate; Potassium sodium L-tartrate tetrahydrate; Potassium sodium dextro-tartrate |
| CAS no. | 6381-59-5 |
| EINECS no. | 206-156-8 |
| Molecular formula | KNaC₄H₄O₆·4H₂O |
| Molecular weight | 282.22 |
| Structure |  |
APPLICATIONS
| Electronics & Piezoelectric Devices: |
| Used in early microphones, phonograph pickups, and oscillators due to its piezoelectric properties. |
| Food Industry: |
| Acts as a food additive (E337) and stabilizer in baking powders. |
| Pharmaceuticals: |
| Used in certain medications as a mild laxative. |
| Analytical Chemistry: |
| Functions as a reagent in Fehling’s solution for detecting reducing sugars. |
| Metal Cleaning & Electroplating: |
| Helps in metal treatment and polishing solutions. |
| Optical and Scientific Applications: |
| Previously used in polarized optical devices and scientific experiments. |
SPECIFICATIONS
| Test | Unit | Specification |
|---|---|---|
| Appearance | – | White crystalline powder |
| Solubility | – | Soluble in water |
| pH at 25°C | – | 6.00 – 8.50 |
| Acidity/Alkalinity | – | NMT 0.1 ml of 0.1N NaOH and 0.1N HCl is required |
| Additional tests: | ||
| Iron | ppm | Max 5.0 |
| Chloride | ppm | Max 5.0 |
| Sulphate | ppm | Max 25.0 |
| Assay | % | Min 99.5 |
PACKING
25 kg bag/drum
STORAGE
Store in airtight container in a cool, dry place
REACH status
Not registered
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