Define degree of ionisation of a weak electrolyte and discuss the factors affecting it.
Answers
Answer:
Degree of ionization is the ratio of the number of ionized molecules and the number of molecules dissolved in water.It can be expressed as a fraction or in percentage.It is generally denoted by \alphaα .
For example:
\ \ \ \ CH_3COOH(aq) \to CH_3COO^-+H^+CH
3
COOH(aq)→CH
3
COO
−
+H
+
t=0\ \ \ \t=0 \ \ c c \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ 0 \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ 0 0 0
t=t\ \ \ \ \ \ \ \ \ \ \ c(1-\alpha)\ \ \ \ \ \ \ \ \ \ \ \ c\alpha\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ c\alphat=t c(1−α) cα cα
where \alphaα is degree of ionization.
Factors affecting degree of ionization:
(a)(a). More is the dilution,higher is the degree of ionization.
(b).(b). Temperature- Generally degree of ionization increases with increase in temperature.
(c).(c). More is the amount of solvent,more is the ionization.
(d).(d). Degree of ionization decreases in presence of a strong electrolyte having a common ion in accordance with Le-Chatlier principle.
(e).(e). Nature of solute
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