4.3.4 Electrolysis of aqueous solutions

• Aqueous solutions contain ions that can be involved in chemical reactions.


  True
• Aqueous solutions contain ions from the dissolved compound in water
• Match the component with its role in an electrochemical cell:

  Anode ↔️ Site of oxidation

  Cathode ↔️ Site of reduction

  Electrolyte ↔️ Conducts ions
• Match the type of solution with an example:

  Aqueous Solution ↔️ Salt water

  Molten Solution ↔️ Molten salt
• The electrolyte in electrolysis of aqueous solutions allows the electric current to flow between the electrodes
• An electrochemical cell consists of an anode, a cathode, and an electrolyte.


  True
• Match the component of an electrochemical cell with its role:

  Anode ↔️ Oxidation

  Cathode ↔️ Reduction

  Electrolyte ↔️ Conducts ions
• During electrolysis, cations move to the cathode
• In the electrolysis of copper sulfate, Cu²⁺ ions are reduced at the cathode.


  True
• Ions higher in the reactivity series are less likely to discharge
• If no reactive ions are present, water molecules can be reduced at the cathode during electrolysis.

  True
• Cations move to the cathode
• Match the electrode with its process:

  Anode ↔️ Oxidation

  Cathode ↔️ Reduction
• An aqueous solution is one where water acts as the solvent.
• Components of an aqueous electrolysis setup

  1️⃣ Anode (+)

  2️⃣ Cathode (-)

  3️⃣ Electrolyte

  4️⃣ Power Supply
• Match the aqueous solution with its ions:

  Sodium Chloride ↔️ Na⁺, Cl⁻

  Hydrochloric Acid ↔️ H⁺, Cl⁻

  Sodium Hydroxide ↔️ Na⁺, OH⁻

  Copper Sulfate ↔️ Cu²⁺, SO₄²⁻
• Which electrode do negatively charged ions move towards during electrolysis?

  Anode
• What process occurs at the anode during electrolysis?

  Oxidation
• Ions higher in the reactivity series are more likely to be discharged during electrolysis.

  False
• During the electrolysis of copper sulfate solution, oxygen gas is produced at the anode.


  True
• Steps involved in the electrolysis of copper sulfate solution

  1️⃣ Copper ions (Cu²⁺) move to the cathode

  2️⃣ Copper ions are reduced at the cathode

  3️⃣ Water molecules are oxidized at the anode

  4️⃣ Oxygen gas is produced at the anode
• A higher concentration of ions increases the likelihood of discharge during electrolysis.


  True
• Ions higher in the reactivity series are more likely to be discharged at the cathode.

  True
• Cations are reduced at the cathode
• What happens if water molecules are oxidized during electrolysis?

  Oxygen gas is produced
• What determines the specific products formed during electrolysis?

  Ions and reactivity
• What is electrolysis?

  Using electricity to break down compounds
• Match the property with the type of solution:

  Water ↔️ Aqueous solution

  Molten compound ↔️ Molten solution

  Conducts electricity ↔️ Both
• When a compound dissolves in water, it breaks into its constituent ions.


  True
• In electrolysis, the anode is the positive electrode, and the cathode is the negative
• When a compound is dissolved in water, it breaks into its constituent ions
• Steps involved in the setup for electrolysis of aqueous solutions:

  1️⃣ Prepare two electrodes: anode and cathode

  2️⃣ Use an electrolyte to allow ion flow

  3️⃣ Apply an electric current
• Reactions occurring at the electrodes during electrolysis of aqueous solutions:

  1️⃣ Oxidation at the anode

  2️⃣ Reduction at the cathode
• At the anode, oxidation occurs, releasing electrons
• What occurs at the anode in an electrochemical cell?

  Oxidation
• Sodium chloride dissociates into Na⁺ and Cl⁻ ions when dissolved in water.


  True
• Anions are oxidized at the anode during electrolysis.


  True
• What gas is produced at the anode during the electrolysis of copper sulfate solution?

  Oxygen
• What happens to cations at the cathode during electrolysis?

  They are reduced
• If ions are not reactive enough to discharge, water molecules can be oxidized at the anode