Advertisements
Advertisements
Question
Write chemical reactions to show the amphoteric nature of water.
Solution
The amphoteric nature of water can be described on the basis of the following reactions:
- Reaction with H2S-
The reaction takes place as:
\[\ce{\underset{Base}{H2O_{(l)}} + \underset{Acid}{H2S_{(aq)}} <=> \underset{Conjugate acid}{H3O^+_{(aq)}} + \underset{Conjugate base}{HS^-_{(aq)}}}\]
In the forward reaction, \[\ce{H_2O_{(l)}}\] accepts a proton from \[\ce{H_2S_{(aq)}}\]. Hence, it acts as a Lewis base. - Reaction with NH3-
The reaction takes place as:
In the forward reaction, `H_2O` denotes its proton to`NH_(3(aq))`. Hence, it acts as a Lewis acid. - Self-ionization of water-
In the reaction, two water molecules react as:
APPEARS IN
RELATED QUESTIONS
What do you understand by the term ’auto-protolysis’ of water? What is its significance?
Complete the following chemical reaction.
\[\ce{PbS_{(s)} + H_2O_{2(aq)} ->}\] ______
Classify the chemical reaction into (a) hydrolysis, (b) redox and (c) hydration reactions.
Complete the following chemical reaction.
\[\ce{MnO^-_{4(aq)} + H_2O_{(g)} ->}\]
Classify the chemical reaction into (a) hydrolysis, (b) redox and (c) hydration reactions.
Complete the following chemical reaction.
\[\ce{CaO_{(s)} + H_2O_{(g)} ->}\]?
Classify the chemical reaction into (a) hydrolysis, (b) redox and (c) hydration reactions.
What is the difference between the terms ‘hydrolysis’ and ‘hydration’?
Do you expect different products in solution when aluminium (III) chloride and potassium chloride treated separately with (i) normal water (ii) acidified water, and (iii) alkaline water? Write equations wherever necessary.
Why is water used in hot-water bottles?
Give a reason why metals are arranged in a series called – ‘activity series of metals’. Name a metal which reacts with
(a) Cold water
(b) Boiling water
(c) Steam to liberate hydrogen in each case.
Give a balanced equation for the following conversion:
Iron to triiron tetroxide using steam.
How does it occur in the free state and in the combined state.
Why is fused calcium chloride and not potassium chloride kept in a desiccator?
How can production of hydrogen from water gas be increased by using water gas shift reaction?
______ does not react with water at any temperature.
Write a short note on the catalytic nature of water.
Write the chemical equation for the production of water when zinc reacts with sulphuric acid.
The metal that gives hydrogen gas upon treatment with both acid as well as base is ______.
