How is sodium hydride made?
How is sodium hydride made?
Preparation: Sodium hydride is prepared by the direct reaction between sodium metal and hydrogen gas. Physical properties: Pure NaH is a colorless or white solid with a density of 1.4 g/mL, and a melting point of 800 °C.
What is NaH used for organic chemistry?
Sodium hydride is the chemical compound with the empirical formula NaH. This alkali metal hydride is primarily used as a strong yet combustible base in organic synthesis. NaH is a saline (salt-like) hydride, composed of Na+ and H− ions, in contrast to molecular hydrides such as borane, methane, ammonia, and water.
How do you quench a sodium hydride reaction?
Slowly add isopropanol to quench sodium hydride. Upon completion, add ethanol or methanol as a more reactive quenching agent to ensure completion. Finally, add water dropwise to make sure there are no pockets of reactive materials.
What is formula of sodium hydride?
NaH
Sodium hydride/Formula
Why is sodium hydride a base?
The H− in NaH accepts an H+ ion from water to form H2 gas, making it a Bronsted-Lowry base. If we were going by the Arrhenius definition of acids and bases, NaH would be a base not because it dissociates to give OH− directly from its chemical structure, but because it results in [OH−] increasing upon dissociation.
How do you quench potassium hydride?
To quench potassium hydride, dilute the concentration of potassium hydride below 5 \% w/v with dry hexane. Cool the resulting solution to 0 ° C and add excess t-butyl alcohol dropwise under nitrogen with stirring. Then, add excess cold water dropwise. Separate the resulting aqueous and organic layers.
How do you make a hydride?
Many metal hydrides can be synthesized by a solid–gas reaction of hydrogen with a metal, an intermetallic compound, or mixtures of metals or binary hydrides and metals. Because of the limited thermal stability of the resulting hydrides, the hydrogenation is usually carried out at moderate temperatures (<800 K).
What is the chemical formula for sodium sulphide?
Na2S
Sodium sulfide/Formula