Search results
Results from the WOW.Com Content Network
The hydride reacts with the weak Bronsted acid releasing H 2. Hydrides such as calcium hydride are used as desiccants, i.e. drying agents, to remove trace water from organic solvents. The hydride reacts with water forming hydrogen and hydroxide salt. The dry solvent can then be distilled or vacuum transferred from the "solvent pot".
A metal hydride can be a thermodynamically a weak acid and a weak H − donor; it could also be strong in one category but not the other or strong in both. The H − strength of a hydride also known as its hydride donor ability or hydricity corresponds to the hydride's Lewis base strength. Not all hydrides are powerful Lewis bases.
Borderline hydrides are most commonly formed via the acidification or reduction of metal salts. For instance, copper hydride is formed by reacting copper sulfate and hypophosphorous acid at about 70 °C, forming a yellow precipitate that soon turns red-brown. [3] Zinc hydride, ZnH 2, can be formed by the reduction of either a zinc halide or ...
The visible band spectrum of magnesium hydride was first observed in the 19th century, and was soon confirmed to be due to a combination of magnesium and hydrogen. Whether there was actually a compound was debated due to no solid material being able to be produced. Despite this the term magnesium hydride was used for whatever made the band ...
Salt-like hydride tellurides may be formed by heating tellurium with a metal hydride in an oxygen-free capsule at around 700°C with a caesium chloride flux to assist in crystal formation. For rare earth elements , this method works as long as tellurium has enough oxidising power to convert a +2 oxidation state to a +3 state.
The hydride ion is quite variable in size, ranging from 130 to 153 pm. [4] The hydride ion actually does not only have a −1 charge, but will have a charge dependent on its environment, so it is often written as H δ−. [4] In oxyhydrides, the hydride ion is much more compressible than the other atoms in compounds. [4]
Sodium hydride is the chemical compound with the empirical formula Na H. 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 , silane , germane , ammonia , and methane .
Potassium hydride, KH, is the inorganic compound of potassium and hydrogen. It is an alkali metal hydride. It is a white solid, although commercial samples appear gray. It is a powerful superbase that is useful in organic synthesis. It is sold commercially as a slurry (~35%) in mineral oil or sometimes paraffin wax to facilitate dispensing. [3]