Electrolysis Flashcards
In electrolysis, which NEGATIVE ion will get discharged first?
The one with LESSER mass (the lighter ion)
In electrolysis, which POSITIVE ion will get discharged first?
The one which is LESS reactive (lower in the reactivity series)
What is the exception for negative ions discharging during electrolysis?
Regardless of the mass, HALLIDE IONS (Br, Cl or I) will get discharged first if the solution is concentrated.
What is the exception for negative ions discharging during electrolysis?
Regardless of the mass, HALLIDE IONS (Br, Cl or I) will get discharged first if the solution is concentrated.
What is observed at the anode during the electrolysis of molten Lead(II) Bromide?
Brown fumes of bromine gas (Br₂) are observed.
What is deposited at the cathode during the electrolysis of molten Lead(II) Bromide?
Silvery-grey lead metal (Pb) is deposited.
What gas is evolved at the anode when electrolysis is performed on concentrated aqueous sodium chloride (Brine)?
Pale green chlorine gas (Cl₂) is evolved.
What is formed at the cathode during the electrolysis of concentrated aqueous sodium chloride?
Hydrogen gas (H₂) is evolved.
What happens to the solution during the electrolysis of concentrated aqueous sodium chloride?
The solution becomes alkaline due to the formation of sodium hydroxide.
What gas is evolved at the anode during the electrolysis of dilute sulfuric acid (H₂SO₄)?
Oxygen gas (O₂) is evolved.
What gas is evolved at the cathode during the electrolysis of dilute sulfuric acid?
Hydrogen gas (H₂) is evolved.
What gas is evolved at the anode when the anode is inert during the electrolysis of aqueous Copper(II) Sulfate (CuSO₄)?
Oxygen gas (O₂) is evolved.
What happens to the anode if it is made of copper during the electrolysis of aqueous Copper(II) Sulfate?
Copper dissolves, forming copper ions.
What is deposited at the cathode during the electrolysis of aqueous Copper(II) Sulfate?
Copper metal is deposited (pink color).
