Potassium sodium tartrate

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Potassium sodium tartrate
Names
IUPAC name
Sodium potassium L(+)-tartrate tetrahydrate
Other names
Rochelle Salt
Seignette Salt
Properties
KNaC4H4O6·4H2O
Molar mass 282.1 g/mol
Appearance large colorless monoclinic needles
Density 1.79 g/cm³
Melting point 167 75 °C (167 °F; 348 K)
26 g / 100 mL (0 ℃); 66 g / 100 mL (26 ℃)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Potassium sodium tartrate (tetrahydrate), more commonly known as Rochelle Salt, is a double salt of tartaric acid first prepared (around 1675) by an apothecary, Pierre Seignette, of La Rochelle, France.

Properties

Chemical

Physical

Uses

  • Potassium Sodium Tartrate is used in the preparation of Biuret reagent.
  • Potassium Sodium Tartrate is used in the the preparation of Fehling's Solution
  • Potassium Sodium Tartrate is used in "crystal" microphones.
  • Potassium Sodium Tartrate is used as an alkaline buffer.
  • Potassium Sodium Tartrate has been used as a laxative.

Availability

Potassium Sodium Tartrate is readily available on EBay.

Preparation

Delete this section if not applicable

Projects

Handling

Can be irritating to skin.

Safety

Storage

Potassium Sodium Tartrate is very deliquescent and should be stored in a sealed container.

Disposal

Dissolve in large excess of water and put down drain.

References

Relevant Sciencemadness threads