Titration Flashcards
Unit 3
what equation allows us to convert from moles to grams and vice versa ?
atomic mass = grams/moles
What equation links moles with concertation?
concertation = moles/ volume
what unit of volume should be used as standard when using c=n/v equation?
dm3
how do we convert cm3 to dm3?
/1000
what values from the periodic table are added together to calculate molar mass of a substance?
relative atomic mass
how many decimal places should molar mass be given to?
1dp
what is meant by an ‘initial reading’ on a burette?
The starting volume
what is meant ‘final reading’ on a burette?
The volume when the endpoint is reach
what is meant by the term titre
the volume used in the burette
what piece of equipment accurately measures the volume placed in the conical flask
25cm3 one mark pipette
what piece of equipment is used to fill the burette
funnel
what piece of equipment holds the solution placed under the burette
conical flask
How do we select indicators
the indicator should have the ph range within the range of the rapid change equal to the point of titration
what is the purpose of trial/rough titration
to get an idea of the titre needed so that we can slowly the flow rate when it is closering to the endpoint
a colour change should be noticed after the addition of one extra ….
drop
the indicator changing colour represents what stage of the titration
endpoint
all titration readings should be to how many decimal places
2dp
all titration reading should end In a … or a …
5 or a 0
what is meant by the phrase concordant result
reading within 0.1cm3 of each other
how do we calculate the titre mean
add all result together the divide by how many results where collected
how can we calculate concentration in g dm3 from mol dm3
conc. mol dm3 X molar mas
what reading do we never in mean titre calculations
trial/rough
how many dps should the mean titre be given to
2 dp
Does the mean titre end in a 0 or a 5?
No
Which volume would be used to calculate unknown concentration? Initial reading, trial titre, titration 1 titre, average titre?
Average
Which indicator is used in a titration with a strong acid and strong base?
Bromothymol blue
Which indicator is used for a weak acid and strong base?
Phenolphthalein
Which indicator is used for strong acid and weak base?
Methyl Orange
What type of acid/base is sodium hydroxide?
Strong base
What type of acid/base is hydrochloric acid?
Strong acid
What type of acid/base is ethanoic acid?
Weak acid
What type of acid/base is sodium carbonate?
Weak base
What piece of glassware is used to make up a star dark solution?
Volumetric flask 100cm3
What shape of the volumetric flask makes it accurate?
Narrow neck make volume changes very easily detectable
What is used to measure out grams of a substance when preparing a solution with accurate concentration?
2 decimal place balance
