Back to AI Flashcard MakerChemistry /OCR A-Level Chemistry: Chapter 23 - Redox And Electrode Potentials

OCR A-Level Chemistry: Chapter 23 - Redox And Electrode Potentials

Chemistry17 CardsCreated 2 months ago

This flashcard set defines redox, oxidation, and reduction, and includes key half-equations for manganate and iodine-thiosulphate reactions. It also explains the visual challenge in detecting the endpoint of vanadium and potassium manganate titrations due to similar solution colors.

Define redox

A reaction in which both reduction and oxidation take place.

Tap or swipe ↕ to flip
Swipe ←→Navigate
1/17

Key Terms

Term
Definition

Define redox

A reaction in which both reduction and oxidation take place.

Define oxidation


The loss of electrons or an increase in oxidation number.

Define reduction

The gain of electrons or a decrease in oxidation number.

What is the Manganate half reaction?

MnO(4)- + 8H+ + 5e- -> Mn2+ + 4H(2)O

What is the iodine sodium thiosulphate reaction?

2S(2)O(3)2- + I(2) -> S(4)O(6)2- + 2I-

Why is there no clear colour change at the end point of a Vanadium and Potassium Manganate titration?

KMnO(4) is purple/pink

V2+ is violet

Related Flashcard Decks

Study Tips

  • Press F to enter focus mode for distraction-free studying
  • Review cards regularly to improve retention
  • Try to recall the answer before flipping the card
  • Share this deck with friends to study together
TermDefinition

Define redox

A reaction in which both reduction and oxidation take place.

Define oxidation


The loss of electrons or an increase in oxidation number.

Define reduction

The gain of electrons or a decrease in oxidation number.

What is the Manganate half reaction?

MnO(4)- + 8H+ + 5e- -> Mn2+ + 4H(2)O

What is the iodine sodium thiosulphate reaction?

2S(2)O(3)2- + I(2) -> S(4)O(6)2- + 2I-

Why is there no clear colour change at the end point of a Vanadium and Potassium Manganate titration?

KMnO(4) is purple/pink

V2+ is violet

What property does the voltmeter have in a cell?

High resistance

Which way does the current flow in the cell?

Negative electrode to the positive electrode

How do the ions flow between cells?

Salt bridge

What is the salt bridge generally made of?

Potassium nitrate

Ammonium nitrate

What is the electrode made of in a standard hydrogen cell?

Platinum

What is in the half cell of Fe3+ and Fe2+?

Inert Pt electrode

Equimolar Fe2+ and Fe3+ (1 mol dm^-3)

When two half cells are connected, which is oxidised and which is reduced?


More reactive metal is oxidised

Less reactive metal is reduced

Define standard electrode potential

The emf of a half cell compared with a standard hydrogen half cell, measured at 298K with solution concentrations of 1 mol/dm^3 and a gas pressure of 101kPa.

What is the electrode potential of a hydrogen half cell?

0.00V

What is the electrode potential of the cell?

Electrode potential of the positive terminal minus the electrode potential of the negative terminal


How do we know if a cell is feasible?

If the electrode potential of the cell is positive, the reaction is feasible.