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Is Selenious acid toxic?

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Is Selenious acid toxic?

Health effects. Like many selenium compounds, selenous acid is highly toxic in excessive quantities, and ingestion of any significant quantity of selenous acid is usually fatal, however it is an approved dietary source in proper amounts.

How do you make Selenous acid?

Selenous and tellurous acids can be obtained by the hydrolysis of the tetrahalides,

  1. (16.115)TeCl4 + 3 H2O → 4 HCl + H2TeO3
  2. (16.116)CaO + SeO2 → CaSeO3
  3. (16.117)2 NaOH + SeO2 → Na2SeO3 + H2O.

What is Selenious acid used for?

Selenious Acid is a white, crystalline (sand-like) solid. It is used as a component for gun blueing, a reagent, an oxidizing agent, and an isotope for labeling radiopharmaceutical compounds.

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Is Selenious acid a strong acid?

Like sulfuric acid, selenic acid is a strong acid that is hygroscopic and extremely soluble in water.

Is Selenious acid strong or weak?

Acids are considered weak if they have a pKa value greater than -2, or pH greater than 2 but less than 7. Arsenic acid, boric acid, linolenic acid, phosphoric acid, selenious acid, hydrofluoric acid.

What does sulfuric acid look like?

Sulfuric acid is a colorless oily liquid. It is soluble in water with release of heat. It is corrosive to metals and tissue. Sulfuric acid, spent appears as a black oily liquid.

What is the formula for Bromous acid?

HBrO2
Bromous acid/Formula

What is formula of Selenious acid?

H2SeO3
Selenous acid/Formula

Does selenic acid dissolve gold?

It is a very strong acid. It reacts with hydrochloric acid to make chlorine and selenous acid. It can dissolve gold to make gold selenate.

How do you make hydrofluoric acid?

Hydrofluoric acid (HF) is produced by the reaction of concentrated sulfuric acid with fluorspar (calcium fluoride): CaF2+H2SO4→2HF+CaSO4. The reaction can take place in two stages.

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How do you concentrate sulphuric acid?

Fortunately, such a process exists and is relatively simple to perform. One can concentrate Sulfuric acid by heating the liquid and boiling off water from the solution, leaving concentrated H2SO4 behind. By following this procedure, Sulfuric acid solutions may be concentrated to upwards of 98\% H2SO4 by weight.

How does selenium react with acids?

Selenium does not react with dilute non-oxidizing acids. Selenium burns in air, forming selenium (IV) oxide, SeO 2. Selenium reacts with fluorine, F 2. At 0 °C, selenium (IV) fluoride is formed, and if burned, selenium (VI) fluoride is formed:

What is the precipitate formed when selenium IV reacts with hydrogen sulfide?

Selene (IV) as selenious acid is oxidized to selenic acid by hydrogen peroxide. Selene (IV) as selenious acid is precipitated by hydrogen sulfide in 0.4 M hydrochloric acid. The yellow precipitate is usually SeS 2, but it can be a mixture of Se and S or all three components

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How is selenic acid precipitated from selenene?

Selene (VI) as selenic acid is precipitated by barium ions. Selene (IV) as selenious acid is oxidized to selenic acid by permanganate. Selene (IV) as selenious acid is oxidized to selenic acid by hydrogen peroxide. Selene (IV) as selenious acid is precipitated by hydrogen sulfide in 0.4 M hydrochloric acid.

What is the reaction of selenium with hydrogen peroxide?

Reaction of selenium with peroxide Selene (IV) as selenious acid is oxidized to selenic acid by hydrogen peroxide. H 2 SeO 3 (aq) + H 2 O 2 (aq) 2 H + (aq) + SeO 42− (aq) + H 2 O (l) Reaction of selenium with sulfide