Researching Chemistry Flashcards
What is a back titration?
A back titration also known as an indirect titration allows the concentration of an unknown solution to be determined by reacting it with a known excess of a reagent.
What happens during a redox titration?
An oxidising agent react with a reducing agent
Reducing agent?
The reducing agent is an electron donor and is itself oxidised during the reaction
Oxidising agent?
The oxidising agent is an electron acceptor and is reduced during the reaction
Name a very useful reagent used in a redox titration
Acidified permanganate as it has the advantage that it also acts as it’s own indicator
When is an end-point observed?
And end-point is observed when all reducing agent has been used up and the reagent used no longer reacts
When do complexometric titrations occur?
They occur in a reaction between metal solution and Ligands. The end-point is indicated by a colour change due to Metal Complexes forming/changing.
Standard solution?
A standard solutions is a solution for which and accurate concentration is known.
What characteristics must a primary standard have?
Be available in a high state of purity; be stable when solid and when in solution; be soluble in water and have a reasonably high GFM to reduce the percentage errors when weighing
During a titration what does the experiment look for?
A permanent colour change in the solution in the conical flask; usually due to the presence of an indicator
Equivalence point?
The point at which the reaction is just complete
