Describe sulphurous acid, Chemistry

Assignment Help:

Q. Describe Sulphurous Acid ?

Sulphurous acid H2SO3 is known only in solution. It exists mainly as a hydrate of sulphur dioxide SO2. 7H2O two series of salts the bisulphites containing HSO-3 and sulphites containing SO2-3 ions are well known.

Sulphurous acid possesses both oxidising as well as reducing properties. It owes its reducing   nature to the ease with which it can get oxidised to sulphuric acid. It reduces I2, to HI, KMnO4 to MnSO4, and K2, Cr207 to Cr2(SO4)3.

H2SO3 + H2O + I2----------------> H2SO4 + 2HI

2KMnO4+ 5SO2+ 2H2O-------> K2SO4+ 2MnSO4+ 2H2SO4

K2Cr2O7+ 3SO2+ H2SO4---------> K2SO4+ Cr2 (SO4) 3 + H2O

In the presence of strong reducing agents like H2S, it can behave as an oxidising agent.

2H2S+ H2SO3-------------------> 3H2O + 3S

Sodium and calcium bisulphite solutions are used in making paper from, wood because they dissolve fibrous material lignin and facilitate pulping of cellulose.


Related Discussions:- Describe sulphurous acid

Difference between phenol and alcohol, Difference between phenol and alcoho...

Difference between phenol and alcohol Property Phenol ( C 6 H 5 OH ) Alcohol ( C 2 H 5 OH ) Odour Typica

How to calculate rate constant or rate equation value?, Various methods are...

Various methods are employed to calculate the rate constant. The method to be adopted and the proper selection depend on the experimental condition and nature of reactants and pr

What does thermodynamics helps in predicting, Predicting the feasibility of...

Predicting the feasibility of reaction and does not show the rate of chemical reaction

why do soaps not work under hard water , The Ca 2+ and Mg 2+ ions in har...

The Ca 2+ and Mg 2+ ions in hard water form scum with soap. Therefore they don''t form lather and therefore don''t clean the dirt.

Resonance, Sometimes more than one valence structure is possible and there ...

Sometimes more than one valence structure is possible and there shows to be no unique assignment. A familiar organic example is in the disposition of single and double C-C bonds in

Confirming compound separation by tlc., Every  precipitate will be collecte...

Every  precipitate will be collected using a Hirsch funnel. Make definite that the plastic frit disc is firmly snapped in place in your focus.  Replacement frit discs are available

Which bond is more strong covalent or ionic .and why? , Generally ionic bon...

Generally ionic bonds are stronger than covalent bonds. This is because in ionic bonds, electrostatic forces of attractin are involved. The positive ion (cation) and the negative

Alcohols, How do we prepare trihydric alcohols?

How do we prepare trihydric alcohols?

Assignment, solution and collegative properties explanation

solution and collegative properties explanation

Silica glass, Silica glass: It is produced by heating pure sand to its mel...

Silica glass: It is produced by heating pure sand to its melting point. Because of absence of refining agents, it is extremely difficult to get rid of all air-bubbles. Moreover, o

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd