Question
Derive the relationship between degree of dissociation and dissociation constant in weak electrolytes.
✓
Answer
Expression of Ostwald’s dilution law in the case of a weak electrolyte :
Consider the dissociation of a weak electrolyte BA.
Let V dm$^3$ of a solution contain one mole of the electrolyte.
Then the concentration of a solution is, $C =\frac{1}{V} mol \ dm ^{-3}$.
Let α be the degree of dissociation of the electrolyte.
Applying the law of mass action to this dissociation equilibrium, we have,
As the electrolyte is weak, α is very small as compared to unity,
$\therefore (1 – \alpha ) ≈ 1.$
This is the expression of Ostwald’s dilution law.
Thus, the degree of dissociation of a weak electrolyte is directly proportional to the square root of the volume of the solution containing $1$ mole of an electrolyte.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Define state function and write two examples of it.
Mention the types of the following solids:
(i) $CaF _2$ (ii) $SiC$ (iii) Ice (iv) $SO _2$ (v) $CaCO _3$ (vi) $ZnS$ (vii) $HCl$ (viii) $CO _2$
→(i) $CaF _2$ (ii) $SiC$ (iii) Ice (iv) $SO _2$ (v) $CaCO _3$ (vi) $ZnS$ (vii) $HCl$ (viii) $CO _2$
What are isotonic solutions? Explain with one example.
What are the applications of a buffer solution ?
Explain interhalogen compounds.
How is oxygen prepared from the following compounds?
$(a) KCIO_4 \ \ \ (b) PbO_2.$
→How is oxygen prepared from the following compounds?
$(a) KCIO_4 \ \ \ (b) PbO_2.$
Write the structures and classify the following amines as primary, secondary, tertiary amines.
Draw structures of $XeF_6, XeO_3, XeOF_4, XeF_2.$
→All Bronsted bases are also Lewis bases, but all Bronsted acids are not Lewis acids. Explain.
Give the structures of the following :
(1) Ethanol
(2) Propan-l-ol
(3) 2-Methylbutan-l-ol
(4) Pentan-3-ol
(5) Butan-2-ol
(6) 3-Methylbutan-2-ol
(7) Hexan-l-ol
(8) 3-Methylpentan-3-ol
(9) 2-Methylpropan-2-ol
(10) Butan-l-ol (H-Butyl alcohol)
(11) 2-Methylpropan-l-ol
(12) 2,3-Dimethylbutan-l-ol
(13) 2, 3-Dimethylbutan-2-oI
(14) 2-MethyIhexan-l-ol
(15) 2,2,3-Trimethylpentan-3-ol
(16) 2,3,3-Trimethylbutan-2-ol
(17) 3-EthyI-4-methylpentan-l-ol.
(1) Ethanol
(2) Propan-l-ol
(3) 2-Methylbutan-l-ol
(4) Pentan-3-ol
(5) Butan-2-ol
(6) 3-Methylbutan-2-ol
(7) Hexan-l-ol
(8) 3-Methylpentan-3-ol
(9) 2-Methylpropan-2-ol
(10) Butan-l-ol (H-Butyl alcohol)
(11) 2-Methylpropan-l-ol
(12) 2,3-Dimethylbutan-l-ol
(13) 2, 3-Dimethylbutan-2-oI
(14) 2-MethyIhexan-l-ol
(15) 2,2,3-Trimethylpentan-3-ol
(16) 2,3,3-Trimethylbutan-2-ol
(17) 3-EthyI-4-methylpentan-l-ol.
Distinguish between electronic and electrolytic conductors.