Titration Practical Flashcards
Why is the burette washed with distilled/ionised water?
To remove impurities
Once the burette is washed with distilled/ ionised water, it is washed with the solution. Why?
To prevent dilution of the solution going into the burette
Why must the funnel be removed after filling the burette?
Otherwise, a drop from the funnel may enter the burette and alter titre value
Why use a volumetric pipette?
It is accurate and measures fixed volume
Why should there not be any large air bubble from below the burette tap in preparing the burette for use before starting the titration?
The air bubble occupies volume of solution during the titration, which leads to a higher titre value
Why is it important to fill the space below the tap in the burette with solution before beginning?
There is an air bubble which occupies volume of solution during the titration, which leads to a higher titre value
Why are 2-3 drops of indicator added?
Indicators are weak acids, so would neutralise the base (leading to a lower titre value)
What are suitable indicators for acid-base titration?
Methyl orange/ phenolpthalein
Why is a conical flask used instead of a beaker?
To prevent spillages during swirling
Why can distilled water be used to wash the sides of the conical flask during titration?
Moles of reactants are unaffected
Why is the conical flask swirled during titration?
To ensure all reactants react with eachother
Why are the contents of the burette added slowly towards to end point?
To not overshoot the end point
Why is the titration method repeated?
To get concordant results
What are concordant results?
Within 0.10 cm^3 of eachotherW
How many d.p. should titre values be given to?
2 d.p.
