Paper 3: Require practical 9 - Investigating pH changes Flashcards
(4 cards)
1
Q
Why does a pH probe need to be calculated?
A
So the pH values for each pH reading are accurate
2
Q
How can you investigate how a weak acid’s pH changes upon addition of strong base?
A
- 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
Q
Why is it important to stir the resulting solution?
A
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
Q
How would you analyse the data?
A
Plot a graph of measured pH values (y) against volume of NaOH added (x)
