00:01
Hello student in this video we are going to discuss about the ksp and from the ksp value how we can calculate the ph.
00:11
In the question it is given that ksp of f .e .o .h.
00:22
Whole 3 is 2 .79 into 10 to the power minus 39 and consent of f .e.
00:37
Cl3 is 5 .15 into 10 to the power minus 3 molar.
00:48
So if we dissociate the fecl 3 in water, we will get fe 3 plus ion and we will get 3 cl minus ion in the in this equation the concentration of f e cl 3 will be equal to that of f e 3 plus ion so if e 3 plus concentration will be similar to that of f e cl 3 that is it will be 5 .15 into 10 to the power minus 3.
01:36
And to precipitate the f .e .o .h, the ionic product of f .e3 plus and oh minus is equal to the ksp.
01:49
That is, we can write this by feoh whole 3 when it will dissociate.
02:01
Fe3 plus plus 3 .o .h minus.
02:08
Now what we say, the ksp will be equal to the concentration of f .e3 plus iron and the oh h minus iron.
02:29
Now we can write the oh minus iron concentration as fe3 ion concentration divided with the ksp.
02:48
So from this we can just put the value of fe3 this and ksp value this.
02:58
So we can write in the top 2 .79 into 10 to the power minus 39 divided by 5 .15 into 10 to the power minus 3...