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RP9: pH changes
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Created by
Amirah A
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Cards (2)
when
strong alkali
is added to
weak
base the
pH
curve will be
higher
up on the graph
Determine Ka practically:
Measure
25cm3
of
acid
into a conical flask using
volumetric
pipette
Use
pH
probe to measure
initial
pH
Add
1cm3
of NaOH from a
burette swirl
and record
pH
Repeat
until in
excess
Plot graph of pH against
volume
of NaOH
Use
vertical
section to find the volume for neutralisation
Half neutralisation point is
half
volume for neutralisation
Read off pH at
half
neutralisation point AND
give equation