redox titration

Question 1

What can titrations be used for?

Answer 1

= finding out the concentration of reducing or oxidising agents

Question 2

if we are finding the concentration of the reducing agent what do we add the the burrete?

Answer 2

= oxidising agent in the birette with known concentration, e.g MnO4-

Question 3

If we are finding the concentration of reducing agent what do we add to the conical flask?

Answer 3

= reducing agent so Fe2+ unkown concentration but known volume

Question 4

How does this titration work?

Answer 4

= add the Mno4- ions, using the birrute to the conical flask containg Fe2+ ions, until u see the faint colour of maganate, this is the end point add drop by drop at this point
= read how much oxidising agent was used, read the bottom eye level of miniscus,

Question 5

How long do we do the titration for?

Answer 5

= until we reach conncordant results, these are within 0.10 cm^3 of eachother

Question 6

What else do we add to the conical flask?

Answer 6

= add excess dilute sulfuric acid
= sufficient H+ ions for the to allow the reduction of the oxidisng agent

Question 7

What can happen one drop after the end point?

Answer 7

= colour would reappear
= use a colourless oxidising agent and a coloured redcuing agent and see when the colour dissapears