Rp 09- Investigating pH Changes Flashcards
What is an acid?
A proton donor
What is a base?
A proton acceptor
What is an alkali?
A base that dissolves in water
Why are acid-base indicators used?
To detect when a reaction reaches completion/becomes neutral, usually by the presence of a colour change.
Why does a pH probe need to be calibrated?
So that the pH values for each pH reading are accurate
How can you investigate how a weak acid’s pH changes upon addition of strong base?
Add 2cm3 of NaOH from a burette to ethanoic acid, in a conical flask.
Continue adding 2cm3 of NaOH, measuring the pH each time
Why’s it important to stir the resulting solution?
So all acid and base is thoroughly mixed, so the pH doesn’t significantly vary throughout the solution as this would give an inaccurate reading.
How would you analyse this data?
Plot a graph Of measured pH values (y-axis) against volume of NaOH solution added (x-axis)
