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topic 7
RoR
Measuring RoR
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How can you measure RoR when gas is given off? (collecting gas)
Measure
time
and collect
gas
in an
upside
down
measuring cylinder in a trough of water or in a gas
Measure
time
and
change
in
mass
How can you measure RoR when a precipitate is formed?
Put a
black
cross
below a beaker containing one reactant
Time how long it takes for the cross to
disappear
after the
second
reactant is added
Why is the
precipitation
method not very accurate?
Its
subjective
so people are most likely to
disagree
over the exact point at which the cross is no longer
visible
How can you measure the RoR using a digital balance (change in mass)
When gas is
produced
this will cause the
mass
to
decrease
This can be carried out on a
digital
balance and the RoR can be calculated by recording the mass at
regular
time
intervals