buffer solutions
Call Kai
Learn
Practice Test
Spaced Repetition
Match
Flashcards
Knowt Play1/9
There's no tags or description
Looks like no tags are added yet.
Name | Mastery | Learn | Test | Matching | Spaced | Call with Kai | Chat |
|---|
No analytics yet
Send a link to your students to track their progress
10 Terms
Buffer solution definition
Solutions that are able to resist a change in pH when small amounts of acid or base are added.
Composition of a buffer
A weak conjugate acid-base pair that forms a reversible reaction to counteract pH changes.
Optimal buffer conditions
High concentration and equimolar concentrations of the weak conjugate acid-base pair.
Why strong acids/bases cannot form buffers
They fully ionise or dissociate in solution
CH3COOH/NaCH3COO vs HCl/NaCl buffers
CH3COOH is a weak acid with a reversible reaction; HCl is a strong acid reacting in only one direction.
Buffering capacity definition
The amount of acid or base which can be added to a buffer before the pH will significantly change.
Factors determining buffering capacity
The magnitude of the concentrations of the acid and conjugate base
Effect of non-similar buffer concentrations
A buffer with dissimilar concentrations will buffer better in one direction than the other.
Equation for buffer preparation using CH3COOH and KOH
CH3COOH(aq) + OH-(aq) ⇌ CH3COO-(aq) + H2O(l)
Preparation method from 1 mol L-1 ethanoic acid and 0.5 mol L-1 KOH
Add equal volumes; KOH reacts with half the moles of ethanoic acid