Advertisements
Advertisements
Question
Distinguish by dilute sulphuric acid.
Sodium sulphide and sodium sulphite?
Advertisements
Solution
| Sodium sulphide | Sodium sulphite |
|
Sodium sulphite is the sodium salt of sulphurous acid having molecular formula Na2SO3, can be made by dissolving NaOH in H2SO3. In Sodium sulphite, the oxidation state of Sulphur is +4. |
Sodium sulphite (Na2SO3) will effervesce when dilute acid is added giving off a colourless gas with a choking smell (sulphur dioxide), which, if bubbled through acidified dichromate solution will turn it green.
|
|
With Sulphuric acid, sodium sulphide liberates H2S.
\[\ce{Na2S + H2SO4 -> Na2SO4 + H2S}\]
|
With sulphuric acid, sodium sulphite liberates SO2 along with water.
\[\ce{Na2SO3 + H2SO4 -> Na2SO4 + H2O + SO2}\]
|
APPEARS IN
RELATED QUESTIONS
Write the missing reactants and products and balance the equations.
\[\ce{KClO3 ->[heat]}\] ___________+ ____________
TRUE \ FALSE
Evaporation of water is a physical change. True or false ?
True or false
New substances are formed in a chemical change.
Fill in the blank
A new substance is formed in a _______ change.
State four conditions necessary for chemical reactions to take place.
Explain by writing a word equation.
Respiration is a chemical change.
Give a chemical test to distinguish between the following gases.
SO2 and Cl2
Limestone contains ______ mainly.
Match the following:
| 1. | Sodium Chloride | a. | CaSO41/2H2O |
| 2. | Calcium sulphate dihydrate | b. | C2H5Oh |
| 3. | Magnesium sulphate hydrate | c. | CaSO4.2H2O |
| 4. | Calcium sulphate hemihydrate | d. | NaCl |
| 5. | Phenol | e. | MgSO4.H2O |
Classify the following as physical or chemical properties
Most metal oxides form alkalis on interacting with water.
