Chemical chemical manufacturers

What is the pKa of sodium hydride?   


jauhar khan 
@jauhar123 | Posted 24 Sep. 2019


Sodium hydride is sold by many chemical suppliers usually as a mixture of 60% sodium hydride (w/w) in mineral oil. Such a dispersion is safer to handle and weigh than pure NaH.

The pKa of the conjugate acid of sodium hydride (NaH) is about 35. NaH is a strong base which would mean when reacting with water the hydride ion will never appear.

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The compound is often used in this form but the pure grey solid can be prepared by rinsing the oil with pentane or THF, with care being taken because the washings will contain traces of NaH that can ignite in air.

Reactions involving NaH require an inert atmosphere, such as nitrogen or argon gas. Typically NaH is used as a suspension in THF, a solvent that resists deprotonation but solvates many organosodium compounds.