Flashcards in C5d- Titrations Deck (13)
What are titrations used for?
to find out concentrations of unknown reactants
What is the equation linking moles, concentration and volume?
Moles = concentration x volume
Interpret a PH curve which starts at ph 4 and ends at ph 12
an alkali has been added to an acid
What is the endpoint?
halfway down the vertical line
What is the equivalence point?
where the moles of acid is equal to the number of moles of alkali
What apparatus do you need in an acid base titration?
Why is it important to use a pipette filler?
to stop alkali getting in your mouth
What is the method for carrying out a simple acid base titration?
1) place the acid (or alkali) into a burette
2) place some alkali(or acid) into a conical flask using a pipette
3) add a suitable indicator (name it)
4) note the initial reading
5) add acid (or alkali) to the flask until the colour changes. Do this drop wise near the endpoint
6) note the final reading
What does concordant mean?
What colour do litmus and phenolphthalein turn in alkali?
litmus - blue
phenolphthalein - red
What colour do litmus and phenolphthalein turn in acid?
litmus - red
phenolphthalein - colourless
Why should an acid base titration use a single indicator rather than a mixed one?
because you want a sudden colour change