What is the order of preferential discharge at the cathode?

A single metal only is deposited at the cathode, suggesting that one of the ions is discharged in preference to the other. Copper is discharged in preference to iron in preference to zinc. This follows the inverse order of the metals in the reactivity series.

What is the cathode and anode product of electrolysis of concentrated aqueous solution of NaCl?

Electrolysis of aqueous sodium chlorideElectrolysis of aqueous NaCl results in hydrogen and chloride gas. At the anode (A), chloride (Cl-) is oxidized to chlorine. At the cathode (C), water is reduced to hydroxide and hydrogen gas.

What is the discharge of ions during electrolysis?

This simply means that in electrolysis, the more reactive the metal, the least tendency for the metal ions to be preferentially discharged at the cathode. Ions of reactive metals like potassium and sodium will remain in the electrolyte solution and will not be discharged.

Which ion is discharged at the cathode during electrolysis?

The negative ions will be attracted towards the anode and the cations are attracted towards the cathode. We know that negative ions discharge at anode and positive ions discharge at cathode.

When is electricity passed through sodium chloride?

Explanation : When electricity is passed through an aqueous solution of sodium chloride, it gives hydrogen, chlorine and sodium hydroxide as a product. The balanced chemical equation is, This process is called as Electrolysis of Brine.

What is preferential discharge of ions during electrolysis?

During electrolysis, the cations being positively charged get attracted towards the negatively charged electrode (cathode) and anions being negatively charged get attracted towards the positively charged electrode (anode). This is termed the preferential discharge of ions during electrolysis.

What are the product of electrolysis of AQ NaCl?

Electrolysis of aqueous sodium chloride yields hydrogen and chlorine, with aqueous sodium hydroxide remaining in solution.

What does the cathode (-) do to ions?

The cathode is an electron donor and can cause reduction to occur. The negatively charged electrode will attract positive ions (cations) toward it from the solution. It can donate some of its excess electrons to such cations or to other species in the liquid being electrolyzed.

What happens at the cathode during electrolysis?

Explanation: At the cathode in an electrolytic cell, ions in the surrounding solution are reduced into atoms, which precipitate or plate out on to the solid cathode. The anode is where oxidation takes place, and the cathode is where reduction takes place.

What happens to feed brine during electrolysis?

During electrolysis, at anode chamber, decomposition of 30\% of NaCl in feed brine taxes place, forming depleated brine at the anode side, which overflows from the anode gas seperator and enters the depleated brine receiver.

How does the electrolysis of NaCl occur in anode chamber?

In anode chamber electrolysis of NaCl occurs, turning Cl- into Cl2 on the anode mesh, Na+ ions moves to the cathode chamber through the ion exchange membrane.

Is the electrolysis of aqueous sodium chloride carcinogenic?

Mercury being carcinogenic is eased out for the electrolysis of aqueous sodium chloride. Presently all the Chlor-alkali industries producing chlorine and sodium hydroxide uses a semipermeable membrane ‘Nafion’ to separate the anode and cathode compartments. Nafion is a sulfonated ionic tetra fluoro-ethylene copolymer.

What is NETnet reaction of electrolysis of very dilute aqueous sodium chloride?

Net reaction of electrolysis of very dilute aqueous sodium chloride is given as; 2H 2 O → H 2 (g) + 2OH – + O 2 (g) E° = – 2.4 V b) High Concentration of Sodium Chloride

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