Titration Flashcards

Unit 3

1
Q

what equation allows us to convert from moles to grams and vice versa ?

A

atomic mass = grams/moles

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2
Q

What equation links moles with concertation?

A

concertation = moles/ volume

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3
Q

what unit of volume should be used as standard when using c=n/v equation?

A

dm3

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4
Q

how do we convert cm3 to dm3?

A

/1000

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5
Q

what values from the periodic table are added together to calculate molar mass of a substance?

A

relative atomic mass

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6
Q

how many decimal places should molar mass be given to?

A

1dp

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7
Q

what is meant by an ‘initial reading’ on a burette?

A

The starting volume

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8
Q

what is meant ‘final reading’ on a burette?

A

The volume when the endpoint is reach

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9
Q

what is meant by the term titre

A

the volume used in the burette

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10
Q

what piece of equipment accurately measures the volume placed in the conical flask

A

25cm3 one mark pipette

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11
Q

what piece of equipment is used to fill the burette

A

funnel

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12
Q

what piece of equipment holds the solution placed under the burette

A

conical flask

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13
Q

How do we select indicators

A

the indicator should have the ph range within the range of the rapid change equal to the point of titration

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14
Q

what is the purpose of trial/rough titration

A

to get an idea of the titre needed so that we can slowly the flow rate when it is closering to the endpoint

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15
Q

a colour change should be noticed after the addition of one extra ….

A

drop

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16
Q

the indicator changing colour represents what stage of the titration

17
Q

all titration readings should be to how many decimal places

18
Q

all titration reading should end In a … or a …

19
Q

what is meant by the phrase concordant result

A

reading within 0.1cm3 of each other

20
Q

how do we calculate the titre mean

A

add all result together the divide by how many results where collected

21
Q

how can we calculate concentration in g dm3 from mol dm3

A

conc. mol dm3 X molar mas

22
Q

what reading do we never in mean titre calculations

A

trial/rough

23
Q

how many dps should the mean titre be given to

24
Q

Does the mean titre end in a 0 or a 5?

25
Which volume would be used to calculate unknown concentration? Initial reading, trial titre, titration 1 titre, average titre?
Average
26
Which indicator is used in a titration with a strong acid and strong base?
Bromothymol blue
27
Which indicator is used for a weak acid and strong base?
Phenolphthalein
28
Which indicator is used for strong acid and weak base?
Methyl Orange
29
What type of acid/base is sodium hydroxide?
Strong base
30
What type of acid/base is hydrochloric acid?
Strong acid
31
What type of acid/base is ethanoic acid?
Weak acid
32
What type of acid/base is sodium carbonate?
Weak base
33
What piece of glassware is used to make up a star dark solution?
Volumetric flask 100cm3
34
What shape of the volumetric flask makes it accurate?
Narrow neck make volume changes very easily detectable
35
What is used to measure out grams of a substance when preparing a solution with accurate concentration?
2 decimal place balance