00:02
Hello students, first of this dissociation of h .o .c .l.
00:05
First of all, we have to know how it gets involved in dissociation.
00:10
That will be dissociated as h plus and ocl minus, which is nothing but the chloride anion.
00:19
Now, here, it is given about the ph, that will be 7, and it is also given about the pga value that will be given as, 7 .54 whereas the concentration of h .o .c .l.
00:36
Is given as 15 mill grams per liter.
00:39
Now we have to find the percentage dissociation of hv.
00:44
First of all we have to consider how the acid will be dissociated as a salt.
00:50
That means we have to know about the concentration of this fluoride animal.
00:55
That is consider that.
00:56
And for this we should require the relationship that will be given by henderson -hasselbald equation henderson -hasselbald equation and its equation will be pheh equal to pga plus logarithm of concentration of a minus it's nothing but the salt by the concentration of h .a.
01:31
Which indicates the acid.
01:33
This will be for the salt and here the salt will be o minus c .f.
01:37
From which we will get this an oil.
01:39
And h .a.
01:40
Is nothing but an acid from which we will got the concentration of our required fluoride anion.
01:46
Let us consider that.
01:48
Let us substitute the given values here, whereas the ph is given as 7, whereas the pta is given as 7 .5.
01:57
Plus lower them of concentration of a minus it's nothing but a concentration of o minus c l by the concentration of h a is nothing but the h o cl concentration as we have already moved the concentration that will be milligrams per liter okay when you consider that if it comes in minus 7 .54 which is equal to lower than of ocel minus by the concentration of h .4 cl, it is given as 15 milligrams per liter.
02:35
As we have known that generally we are considered in terms of grams per liter.
02:39
If you go to convert it to there, we have to multiply.
02:42
Now it will give the 0 .54 with the minus which is equal to lower than of concentration of 4 minus cl, no rate and 1 by 15 into 10 to the 4 minus 3 grams per liter.
02:57
That will be considered as the concentration...