DM 1 - Formulae, Equations and Amount of Substance

Question 1

What is a redox titration?

Answer 1

A redox titration is a titration of a reducing agent by an oxidising agent or vice versa

Question 2

What equipment is used to carry out a titration?

Answer 2

• A pipette and pipette filler are used to measure out the volume of a reactant accurately before transferring it into a conical flask, where the reaction will occur
• A burette is used as it is a controlled way to add small volumes of one reactant to another reactant

Question 3

What can MnO4- titrations be used to analyse?

Answer 3

MnO4- titrations can be used to analyse a variety of reducing agents, for example:
- Fe 2+ ions
- Ethanedioic acid (COOH)2
The MnO4- is reduced to Mn 2+

Question 4

How do you do a titration with potassium manganate(VII)?

Answer 4

• Add the potassium manganate(VII) solution into the burette
• The other reactant solution is acidified with dilute H2SO4 and placed into a conical flask
• The potassium manganate(VII) solution flows into the flask and as it reacts, it becomes colourless. When there is the first trace of a permanent pale pink solution, close the burette tap