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

Physical Chemistry assignment, apparatus and principle of Flah photolysis.....

apparatus and principle of Flah photolysis...and 3rd order reaction with two same and one different concentration.

Properties of nitrophenols, Properties of Nitrophenols:  O-Nitrophenol ...

Properties of Nitrophenols:  O-Nitrophenol is a yellow in colour crystalline compound, whereas m- and p-isomers are colourless crystalline compounds. Isomer             orth

Enthalpy and hess’ law, The enthalpy change (ΔH) in a reaction is equal to ...

The enthalpy change (ΔH) in a reaction is equal to the heat input under conditions of constant pressure and temperature. It is not equal to the total energy change, as work may be

Determine the change in entropy of the system, Two compartments each of 1m ...

Two compartments each of 1m 3 capacity are connected by a valve and insulated from the surroundings and from each other. One compartment contains saturated steam at 683.6 kPa and

Degree of freedom, F of NH4Cl->NH3 +HCl when p(NH3)not =p(HCl) F of KClO3->...

F of NH4Cl->NH3 +HCl when p(NH3)not =p(HCl) F of KClO3->KCl +O2 KClO3=solid &KCl=solid & other are in gas. PLEASE REPLY TODAY(NEED TO COMPLETE THE ASSIGNMENT)

How do we measure food texture, Q. How do we measure food texture? Foo...

Q. How do we measure food texture? Food texture can be evaluated by mechanical test or instrumental methods. This is called as objective evaluation. When we use the human sens

Zone refining process, how can we refine metal by zone refining process

how can we refine metal by zone refining process

Types of rocket propellants - solid propellants, Solid propellants thes...

Solid propellants these types of propellants are mixtures of solid fuel and a solid oxidizer. These are further categorized into two sub-classes, (1) Composite propellants

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