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PART - 1 CH - 6 Equilibrium — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryPART - 1 CH - 6 Equilibrium2 Marks
Question
(a) Differentiate between dissociation and ionization.
(b) What is the relationship between dielectric constant of solvent and electrostatic force between ions?
✓

Answer

(a) Dissociation : The solute which have ions in solid state also, and when dissolved in water their ions get separated is known as dissociation.
$
Na^{+} Cl^{-}(g) \xrightarrow{+H_2 O} Na^{+}(aq)+Cl^{-}(aq)
$
Ionization : The process in which neutral atom do not have ion initially but when dissolved in water it gives ions, is known as ionization.
$
\text { Example : } HCl(g) \stackrel{+H_2 O}{\rightleftharpoons} H_3 O^{+}(aq)+Cl^{-}(aq)
$
Nowadays there is no difference considered between ionisation and dissociation.
(b) The electrostatic force of attraction between two oppositely charged ions is inversely proportional to dielectric constant of the medium (solvent) i.e. the solvent which has higher dielectric constant is a good solvent for ionic substances. Water is a universal solvent whose dielectric constant is high (80).

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