This is what a buffer is.
It is a solution which resists change to pH. This is what a buffer is.
It is a solution which resists change to pH.
So you create this solution
and if you add an acid or you add
base to the solution, the
pH will not change very much.
It will resist the change.
This is a recipe in a sense.
What is in the solution that makes it a buffer?
It needs to have a week acid
and its salt. It needs to have a week acid
and its salt.
Or a weak base and its salt.
But lets look at what I mean by that.
If it is a weak acid and it is But lets look at what I mean by that.
If it is a weak acid and it is
salt, the salt is
[take a weak acid, and I am going to take a weak acid
and write it in this space right here [take a weak acid, and I am going to take a weak acid
and write it in this space right here
HF for example.] and write it in this space right here
HF for example.]
I take take weak acid
and I were to
think about what its
conjugate base is, that would be F-. think about what its
conjugate base is, that would be F-.
And then if I were to create the salt from that
I would need to add and ion with it.
So a counter ion, like cation
NaF
would be a salt
containing that weak base.
So a buffer consists of a weak acid.
and the salt of its conjugate base.
It could also consist of a weak base
and its salts. So lets think of a weak base.
Ammonia is a weak base.