5. Redox Titrations Flashcards

1
Q

redox titrations find out

A

how much oxidizing agent is needed to
exactly react with a quantity of reducing agent
(or vice versa)

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2
Q

transition elements are used as

A

oxidising and reducing agents

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3
Q

why are transition elements used as oxidising and reducing agents

A

good at changing oxidation state (readily give out/receive electrons)
change in oxidation state = change color (easy to spot when reaction is finished)

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4
Q

rule of titration

A

add known concentration to substance of unknown concentration

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5
Q

titration steps

finding out how many manganate (VII) ions (MnO4-) are needed to react with reducing agent

A
  1. measure quantity of reducing agent e.g Fe2+(aq) ions using a pipette, and put in conical flask
  2. add some dilute sulfuric acid in excess to conical flask. (ensures plenty of H+ to allow oxidising agent to be reduced)
  3. gradually add aqueous MnO4- (oxidising agent) to reducing agent using burette, swirling conical flask
  4. stop when mixture in flask just becomes tainted with colour of MnO4- and record volume of oxidising agent added
  5. run a few titrations then calculate mean volume of MnO4-
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6
Q

how to make colour changes easier to spot

A

doing reaction in front of a white surface

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7
Q

oxidising agent _____ electrons and gets ______

A

accepts

reduced

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8
Q

reducing agent _____ electrons and gets _____

A

donates

oxidised

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