00:01
Hello students, in this question we are asked to find out ph of weak acid.
00:06
So let the acid be ha.
00:09
This reacts with h2o, results in the formation of h3o plus plus a minus.
00:17
Now we will prepare a ice table for this.
00:20
So initial the concentration is given as 0 .31.
00:24
Initially others are not present, changes minus x here, x here, x here, equilibrium 0 .31 minus x, x and x.
00:40
So ka is equal to concentration of h3o plus into concentration of a minus divided by concentration of ha.
00:53
So ka value is given as 9 .2 into 10 to the power minus 6 is equal to x into x upon 0 .31 minus x.
01:04
So as x is very very small as compared to ka, we will ignore this x in the minus space.
01:14
So x square will be equal to 9 .2 into 10 to the power minus 6 into 0 .31...