00:01
Nah2po4 is a salt formed the reaction between a weak acid and a strong base.
00:05
It can be considered as the conjugate base of the weak acid.
00:09
In water, nah2po4 dissociates as follows.
00:15
Nah2po4 solid gives na positive aqueous plus h2po4 negative aqueous.
00:26
The h2po4 - is ion and can further undergo a second dissociation to form h2po4 - and h - ion.
00:37
H2po4 - aqueous gives h +, plus hpo4 - aqueous.
00:49
Since h2po4 -x as a weak acid, we need to consider the ionization of this species.
00:57
We can use the acid dissociation constant ka to determine the extent of ionization.
01:04
The value of ka for h2po4 -x is approximately 6 .2 x 10 -8.
01:11
So, to calculate the ph of the solution, we need to determine the concentration of h -positive ions in solution...