Potassium Sodium L-Tartrate Tetrahydrate 99%

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Potassium sodium tartrate tetrahydrate, also known as Rochelle salt, is a double salt of tartaric acidPotassium sodium tartrate and monopotassium phosphate were the first materials discovered to exhibit piezoelectricity.[3]This property led to its extensive use in "crystal" gramophone (phono) pick-ups, microphones and earpieces during the post-World War II consumer electronics boom of the mid-20th Century. Such transducers had an exceptionally high output with typical pick-up cartridge outputs as much as 2 volts or more. Rochelle salt is deliquescent so any transducers based on the material deteriorated if stored in damp conditions.

Molar mass 282.1 g/mol
Appearance large colorless monoclinic needles
Odor odorless
Density 1.79 g/cm³
Melting point 75 °C (167 °F; 348 K)
Boiling point 220 °C (428 °F; 493 K) anhydrous at 130 ℃; decomposes at 220 ℃
26 g / 100 mL (0 ℃); 66 g / 100 mL (26 ℃)
Solubility in ethanol insoluble