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

Chemical methods - purification of organic compounds, Chemical methods - Pu...

Chemical methods - Purification of organic compounds Besides these physical methods, few chemical methods have as well been utilized to separate a mixture of organic compounds.

Illustrate resonance structures, Illustrate resonance structures that defin...

Illustrate resonance structures that define the electronic structure of benzene. Illustrate the structures of all conceivable disubstituted benzene isomers bearing two

Liquefaction of gases, Assainment of liquefaction of gases in degr...

Assainment of liquefaction of gases in degree 2 nd sem

Alcoholic acidity, how much percentage alcoholic acidity content in wwheat ...

how much percentage alcoholic acidity content in wwheat flour sample

Reaction, how analysis of iodine value

how analysis of iodine value

What is sublimation energy, The amount of energy needed to convert one mole...

The amount of energy needed to convert one mole of solid substance to vapor state is known as Sublimation energy

Molarity and normality, When 100 ml of M/10 H2SO4 is mixed with 500 ml of M...

When 100 ml of M/10 H2SO4 is mixed with 500 ml of My/10 NaOH then nature of resulting solution and normality of excess reactant left is

Atom, what are the subatomic particles present in an atom?

what are the subatomic particles present in an atom?

Organic chemistry, What are the theoretical physical properties of esters?

What are the theoretical physical properties of esters?

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