Potassium Permanganate and Redox Titration 1 (Leaving Cert Chemistry): Flashcards
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Chemical formula of potassium permanganate
Chemical formula of potassium permanganate
Colour of potassium permanganate solid
Colour of potassium permanganate solid
Purple
Role of in redox reactions
Role of in redox reactions
Strong oxidising agent
Special property of in titrations
Special property of in titrations
Self-indicating
Why not a primary standard
Why not a primary standard
Cannot obtain high purity, unstable, decomposes, conc. varies
Colour change: to in acid
Colour change: to in acid
Purple to colourless
Ratio of to in reaction
Ratio of to in reaction
1:5
Endpoint colour in permanganate titration
Endpoint colour in permanganate titration
Faint pink colour persists
Problem with
Problem with
Loses water of crystallisation (efflorescence)
Primary standard used instead of iron(II) sulfate
Primary standard used instead of iron(II) sulfate
Ammonium iron(II) sulfate
Formula: ammonium iron(II) sulfate
Formula: ammonium iron(II) sulfate
Why acidic conditions needed in permanganate titration
Why acidic conditions needed in permanganate titration
Provides ions needed for reaction
Typical concentration for titrations
Typical concentration for titrations
0.02 M
Where to read meniscus for purple solution
Where to read meniscus for purple solution
From the top (not bottom)
Definition: Efflorescence
Definition: Efflorescence
Spontaneous loss of water of crystallisation