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Paper 3: Require practical 9 - Investigating pH changes
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Total cards: 4•Content version: v4•Public deck•Updated: 8/1/2026
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#1
Front (Question)
Why does a pH probe need to be calculated?
Back (Answer)
So the pH values for each pH reading are accurate
#2
Front (Question)
How can you investigate how a weak acid’s pH changes upon addition of strong base?
Back (Answer)
• Add 2cm^3 of NaOH from burette to ethanoic acid, in a conical flask • Continue adding 2cm^3 of NaOH measuring the pH each time
#3
Front (Question)
Why is it important to stir the resulting solution?
Back (Answer)
So all the acid and base is fully mixed, so the pH doesn’t significantly vary throughout the solution as this would give an inaccurate reading
#4
Front (Question)
How would you analyse the data?
Back (Answer)
Plot a graph of measured pH values (y) against volume of NaOH added (x)