Electro Chemistry Flashcards
Resistance in electrolytic conductor is due to
Viscosity of medium; inter ionic attraction.
Conductance (g) =
1/r
Cell constant =
G* = l/a
Specific conductance (K)
K = gxg*
Molar conductivity or conductance =
Kx v or kx1000 /M
Equivalent conductivity
K x 1000/N
Relation b/ w molar & eqw. Conductance
Eqw. Conductance= molar conductance/valence factor
Factors affecting electrolytic conductance
A) inter ionic attraction.
B. Polarity of solvent
C. Viscosity oF medium
D. Hydrated size
E. Dilution.
Inter ionic attractions ↑ then
Conductance ↓
Dielectric constant (polarity) ↑ then
Conductance ↑
Viscosity ↑
Conductance ↓
Temp ↑ then
Conductance ↑ k.e ↑ viscosity ↓ f.a ↓
Hydration of ions ↑
Conductance ↓
On dilution of strong electrolyte and weak electrolyte
) Inter atomic forces ↓ conductance ↑
) a↑ conductance ↑
On dilution; specific conductance
↓ as no of ions in 1 ml solution ↓
Molar and equivalent conductance effector on dilution
↑ as M and N↓
Molar conductance of electrolytes at infinite dilution
^m=^m*- b root c,, where b is coast. (Molar conductance ^m)
^eq* of cation and anion at infinite dilution*
^eq(c) + ^ eq (a)
Molar condctsnce at infinite dilution
^m * =x^m* (c) + ^m*(a)
Calculating degree of dissociation using kohl law.
Degree of disassociation =^ /^* [ equivalent conductance at given concentration/
equivalent conductance at Infiniti dilution ]
Dissociation constant of weak electrolyte
K= Caa/1-a [ a= degree of dissocition)
If a =5 or a<5 then K = caa
Solubility of sparingly soluble salt
S= Kx 1000 /^m*
Debye huckel onsagr equation
Vm=Vm* + a root C
