moles II 5.1

Question 1

1dm3 =

Answer 1

1000cm3

Question 2

moles=

Answer 2

volume/24dm3

Question 3

volume=

Answer 3

moles x 24dm3

Question 4

reacting gas moles

Answer 4

covert mass of reactant 1 into moles
use the mole ratio from the balancing numbers
convert moles of reactant 2 into volume

Question 5

how is the concentration of a solution measured

Answer 5

how much route is dissolved per unit volume

Question 6

concentration=

Answer 6

moles of solute/volume of solvent

Question 7

what does a titration calculate

Answer 7

measures the volume of acid needed to neutralise a particular volume of alkali

Question 8

equipment used in titrations

Answer 8

volumetric pipette
burette

Question 9

titration set up

Answer 9

use pipette to place 25cm3 of unknown alkali into conical flask
add a few drops of phenolphthalein or methyl orange
fill a burette with acid and clamp above conical flask

Question 10

titration usage

Answer 10

measure initial vol of known acid
use burette to add acid into the flask drop by drop and swirling the flask
as soon as the colour changes close burette
measure final vol of acid
(final vol - initial vol)