Conductance and conductivity, Chemistry

Assignment Help:

Conductance and conductivity:

When a field (electric) is put across an aqueous ionic solution by applying a voltage between two parallel plate electrodes, the cations are attracted towards to the negative plate (cathode) and the anion towards the positive plate (anode). This movement of ion in a field is called migration and the movement of charge results in a current in the electric circuit connecting the electrodes. The field between the plates is initially linear and produces a constant ion velocity at all points. If there is no redox reaction, cations and anions will separate and collect at the cathode and anode respectively with time, balancing the electrode charge and there will be fewer ions in the bulk of solution. This is a process known as concentration polarization which also leads to the modification of the original linear potential profile between the two electrodes and a variation of ion velocity between the plates. The current will also fall with time. Concentration polarization is therefore useful when separating ions is define, such as in electrophoresis and electro osmosis, but that is to be avoided when measuring fundamental ion motion.

1205_molar conductance.png

Fig. 1. The effect of an AC voltage on the ion motion as electrode polarity is switched.

The ions then alternately migrate first to one plate and then the other during cycling, so that the ions oscillate around a fixed position, avoiding concentration polarization.


Related Discussions:- Conductance and conductivity

Electrolysis of water, Electrolysis of Water without Indicator • Assembl...

Electrolysis of Water without Indicator • Assemble the power supply for electrolysis. Attach alligator clips to the separate poles of the battery. Make sure that the wires from

Organic chemistry, why isoquinoline is weak base as compare to quinoline?

why isoquinoline is weak base as compare to quinoline?

Explain greater dipole moment, Which of the following two compounds would y...

Which of the following two compounds would you wait for to have a greater dipole moment? Support your reply by writing the corresponding (plausible) resonance structures.

How tert-butylamine is prepared, Tert-butylamine Tert-butylamine cannot...

Tert-butylamine Tert-butylamine cannot be prepared by the Gabriel synthesis because it would require that the nitrogen of phthalimide be alkylated with tert-butyl bromide in an

Thermoplastic and thermosetting plastic resins, Q.  Differentiate the ther...

Q.  Differentiate the thermoplastic and thermo sets.                                   OR Write note on thermoplastic and thermosetting plastic resins. Ans.  T

Explain ionization energy, Q. Explain Ionization Energy? Ans. When...

Q. Explain Ionization Energy? Ans. When an electron is removed from an atom, the atom has been ionized. Therefore, the energy required to remove an electron from an atom i

Determine the change in entropy of the system, Two compartments each of 1m ...

Two compartments each of 1m 3 capacity are connected by a valve and insulated from the surroundings and from each other. One compartment contains saturated steam at 683.6 kPa and

Atoms, what is the gram atomic mass of hydrogen and oxygen?

what is the gram atomic mass of hydrogen and oxygen?

Physical properties - alkenes, Physical Properties - Alkenes (i) Alkene...

Physical Properties - Alkenes (i) Alkenes are odourless and colourless. (ii) Alkenes are soluble in organic solvents and insoluble in water. (iii) Physical state of Alken

Measurements, Hi, my name is Teesta and I need your help with this question...

Hi, my name is Teesta and I need your help with this question: You are asked to make 1 Liter of 5M Sodium Chloride (NaCl). How many grams of NaCl are needed?

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd