ï»¿ Distinguish between: (a) Electrolytes and non-electrolytes, (b) Reduction potential and oxidation potential (c) Primary cells and secondary cells, (d) Specific conductivity and molar conductivity. from Chemistry Electrochemistry Class 12 Nagaland Board

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Distinguish between: (a) Electrolytes and non-electrolytes, (b) Reduction potential and oxidation potential (c) Primary cells and secondary cells, (d) Specific conductivity and molar conductivity.

a)

 electrolytes nonelectrolyte An electrolyte dissociates in solution and thus produce ion. A nonelectrolyte does not dissociate at all in solution and therefore does not produce any ions. Electrolytes are ionic  substance that dissolve in water Nonelectrolytes are typically polar covalent substances that do dissolve in water as molecules instead of ions.

C)

 Primary cell Secondary Lower initial cost. Higher Initial Cost Higher life-cycle cost ($/kWh). Lower life-cycle cost ($/kWh) if charging in convenient and inexpensive Disposable. Regular maintenance required. Typically lighter and smaller  thus traditionally more suited for portable applications. Traditionally less suited for portable applications, although recent advances in Lithium battery technology have lead to the development of smaller/lighter secondary batteries.

d)
 Molar conductivity Specific conductivity Molar Conductivity of a solution at a given concentration is the conductance of the volume V of solution containing one mole of electrolyte kept between two electrodes with area of cross section A and distance of unit length. Therefore, Distance is unit  so l = 1 Volume          = area of base × length So V   = A × 1  = A Λm       =κA/l Λm       = κV Conductivity of a solution is equal to the conductance of a solution of 1 cm length and cross section area of 1 square cm.  it may also be define as the conductance of ine centimeter cube of the conductor . It is represented by the symbol Kappa (κ). mathematically we can write κ = 1/ p here ρ is resistivity the unit of K is ohm –1 cm –1 or S cm–1 The conductivity, κ, of an electrolytic solution depends on the concentration of the electrolyte, nature of solvent and temperature.
143 Views

Can you store copper sulphate solutions in a Zinc pot?

No. Because zinc is more reactive than copper and thus holes will be developed in zinc pot.

Cu2+(aq) + Zn(s) → Zn2+ (aq) + Cu(s)
1384 Views

Calculate the potential of hydrogen electrode in contact with a solution whose pH is 10.

For hydrogen electrode, ,
given that      pH = 10
use formula [H+] = 10–pH
so that  [H+] = 10−10 M
Electrode reaction will
H+  + e –  →1/2 H2
Use the formula

1279 Views

Calculate the emf of the cell in which the following reaction takes place:
Ni(s) + 2Ag+ (0.002 M) $\to$ Ni2+ (0.160 M) + 2Ag(s)
Given that

$\mathrm{Ni}\left(\mathrm{s}\right)+2{\mathrm{Ag}}^{+}\left(\mathrm{aq}\right)\to {\mathrm{Ni}}^{2+}\left(\mathrm{aq}\right)+2\mathrm{As}\left(\mathrm{s}\right)$

or

The equation is also written as

or

= 1.05 V – 0.0295 x log 80

= 1.05 V – 0.0295 x 1.9031

= 1.05 V – 0.056 = 0.99 V.

1585 Views

Consult the table of standard electrode potentials and suggest three substance that can oxidize ferrous ions under suitable conditions.

oxidation of ferrous ion means :

Fe2+--> Fe3+ +e-
Any substance which standard electrode potential is more than that of Fe+3 /F+2 can oxidise ferrous ions.
(refer to the table given in book)

The EMF of the substance whose reduction potentials greater than 0.77V will oxidised ferrous ion.
for example Br2, Cl2,and F2 .

879 Views

How would you determine the standard electrode potential of the system Mg2+/Mg?