What is Potassium Sodium Tartrate CAS 304-59-6?

Potassium Sodium Tartrate CAS 304-59-6 is the tetrahydrate double salt of tartaric acid, commonly called Rochelle salt. It has the formula C4H4KNaO6·4H2O and molecular weight 282.22 g/mol.

Why is Rochelle salt used in electroplating?

In alkaline plating baths, it acts as a complexing or chelating agent to control free metal-ion concentration and prevent precipitation. This helps produce smoother copper deposits and more stable plating solutions.

What are the main food and analytical uses?

It is listed as food additive E337 and can be used as a buffer or stabilizer in certain food applications. It is also used in Fehling's solution for reducing-sugar analysis and in some baking-powder systems to control carbon dioxide release.

What physical and solubility properties should be expected?

The material is typically colorless to white crystals or crystalline powder with a cool saline taste. It is freely soluble in water but only slightly soluble or insoluble in alcohol, and the tetrahydrate form contains water of crystallization.

What other industrial applications are relevant?

Rochelle salt is used in mirror silvering, electronics and piezoelectric devices, and as a component in certain pyrotechnic or combustion-related formulations. The appropriate grade depends on whether the final use is food, analytical, electroplating, or technical.

Potassium Sodium Tartrate CAS 304-59-6

Potassium Sodium Tartrate, CAS 304-59-6, also known as Rochelle salt, is a double salt of tartaric acid supplied for alkaline copper electroplating, food buffering and leavening, analytical reagents and mirror silvering. Confirm the required grade and specification, then request a quotation with COA/TDS/SDS for bulk supply.

CAS: 304-59-6
Synonyms: Rochelle salt, Seignette salt, Potassium sodium L-tartrate, Sodium potassium tartrate
Einecs: 206-156-8
Molecular Formula: C₄H₄KNaO₆·4H₂O
Grade: Food Grade (E337) / Tech Grade / Electroplating Grade / USP
Package: 25kg/Kraft Paper Bag or Woven Bag with PE inner liner

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Product Description

Potassium Sodium Tartrate, CAS 304-59-6, also called Rochelle salt, is a double salt of tartaric acid.

Synonyms: Rochelle salt; Seignette salt; Potassium sodium L-tartrate; Sodium potassium tartrate.

CAS: 304-59-6.

It has the formula C4H4KNaO6·4H2O and molecular weight 282.22 g/mol, and appears as colorless to white crystals or crystalline powder.

It has a cool saline taste and is freely soluble in water but only slightly soluble or insoluble in alcohol.

It has an assay of 99.0–102.0% and a pH of about 6.5–8.5 in a 5% solution.

It is used as a complexing and chelating agent in alkaline copper plating baths.

It is listed as food additive E337 and used as a buffer or stabilizer in food applications.

It is combined with sodium bicarbonate in baking powders to control carbon dioxide release.

It is used in Fehling’s solution for reducing-sugar analysis.

It is used as a reducing agent in mirror silvering.

It is used as a saline cathartic in some medicinal formulations.

It is used in crystal microphones and piezoelectric devices for its piezoelectric properties.

It slightly effloresces in warm, dry air by losing water of crystallization.

Confirm appearance, assay, alkalinity, loss on drying, pH, heavy metals, arsenic, chloride, sulfate, iron, solubility and specific gravity.

Store in a cool, dry, well-ventilated warehouse below 25 °C and keep containers tightly sealed.

Confirm packaging with the requested quantity and destination requirements.

The page is an RFQ entry point and does not state stock, price, MOQ or fixed lead time.

For an RFQ, state the intended use, required grade and specification, quantity, packaging, destination and document needs.

FAQ - Technical & Supply Chain

Q:
What is Potassium Sodium Tartrate CAS 304-59-6?

A: Potassium Sodium Tartrate CAS 304-59-6 is the tetrahydrate double salt of tartaric acid, commonly called Rochelle salt. It has the formula C4H4KNaO6·4H2O and molecular weight 282.22 g/mol.
Q:
Why is Rochelle salt used in electroplating?

A: In alkaline plating baths, it acts as a complexing or chelating agent to control free metal-ion concentration and prevent precipitation. This helps produce smoother copper deposits and more stable plating solutions.
Q:
What are the main food and analytical uses?

A: It is listed as food additive E337 and can be used as a buffer or stabilizer in certain food applications. It is also used in Fehling's solution for reducing-sugar analysis and in some baking-powder systems to control carbon dioxide release.
Q:
What physical and solubility properties should be expected?

A: The material is typically colorless to white crystals or crystalline powder with a cool saline taste. It is freely soluble in water but only slightly soluble or insoluble in alcohol, and the tetrahydrate form contains water of crystallization.
Q:
What other industrial applications are relevant?

A: Rochelle salt is used in mirror silvering, electronics and piezoelectric devices, and as a component in certain pyrotechnic or combustion-related formulations. The appropriate grade depends on whether the final use is food, analytical, electroplating, or technical.

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