U2-1-5 - Indicators Flashcards
1
Q
When can we see an obvious colour change between HIn and In–?
A
When [HIn] and [In–] differ by a factor of 10.
2
Q
Equivalence point
A
The exact point of neutralisation
(solution pH = pH of the salt formed)
3
Q
How do you know if an indicator is suitable for a titration?
A
Colour must change around the equivalence point
4
Q
Why can’t indicators be used for weak acid/weak base titrations?
A
pH change too gradual around equivalence point
(endpoint too difficult to spot)
