11 – Standardising a Potassium Permanganate Solution (LC 2027) (Leaving Cert Chemistry): Quizzes
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Practise the questions
12 questions from this quiz
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Practise the questions
12 questions from this quiz
What is standardisation in chemistry?
What is standardisation in chemistry?
Determining exact concentration by titration
Why is ammonium iron(II) sulfate a good primary standard?
Why is ammonium iron(II) sulfate a good primary standard?
Stable, no moisture absorption, high molar mass
Why must the crystals be dissolved in dilute sulfuric acid rather than water?
Why must the crystals be dissolved in dilute sulfuric acid rather than water?
To prevent oxidation of ions
What essential role do ions play in the permanganate reaction?
What essential role do ions play in the permanganate reaction?
Needed for permanganate reduction
Before use, what should the burette be rinsed with?
Before use, what should the burette be rinsed with?
The solution to be used
Why must sulfuric acid be in excess during the titration?
Why must sulfuric acid be in excess during the titration?
To provide sufficient ions
What indicates insufficient acid was added during titration?
What indicates insufficient acid was added during titration?
Brown precipitate forms
Why is potassium permanganate described as self-indicating?
Why is potassium permanganate described as self-indicating?
It acts as its own indicator
What is the correct end point colour in this titration?
What is the correct end point colour in this titration?
Permanent faint pink
What is autocatalysis in this experiment?
What is autocatalysis in this experiment?
Reaction speeds up as forms
What is the mole ratio of to in the balanced equation?
What is the mole ratio of to in the balanced equation?
1:5
Within what volume should concordant titres agree?
Within what volume should concordant titres agree?
0.1
