selenous acid

Another way to make it is to heat selenous acid.

When heated above 200 C, it releases oxygen and turns into selenous acid.

Then selenous acid is reacted with bases to make selenites.

Selenous acid is easily formed upon the addition of selenium dioxide to water.

Often the terms selenous acid and selenium dioxide are used interchangeably.

It is made by dissolving selenium dioxide in water and making selenous acid.

When in acidic conditions it makes selenous acid.

It dissolves in water to make selenous acid.

In many cases of selenium poisoning, selenous acid is formed in the body.

Selenous acid, also known as selenious acid, is a chemical compound.

It reacts with acids to make selenous acid.

It hydrolyses in water giving hydrofluoric acid and selenous acid.

SeO is considered an acidic oxide: it dissolves in water to form selenous acid.

It decomposes above 200 C, liberating oxygen gas and being reduced to selenous acid:

Salts of selenous acid are called selenites.

Selenous acid is very toxic.

Selenites and selenous acid are moderate oxidizing agents.

Selenous acid is bubbled with sulfur dioxide (reduction step) to give elemental selenium.

Selenous acid is analogous to sulfurous acid, but it is more readily isolated.

Selenous acid is a weak acid.

The selenium dioxide is then mixed with water and the solution is acidified to form selenous acid (oxidation step).

In contrast to the analogous compound Selenous acid, Tellurous acid is only metastable.

Hydrogen sulfide reacts with aqueous selenous acid to produce selenium disulfide:

Selenous acid can also be made directly by oxidizing elemental selenium with nitric acid:

It can be made by oxidation of selenous acid with a strong oxidizing agent, such as potassium permanganate, chlorine, or bromine.