00:02
Dear students, here hydronium ion concentration oh - ion concentration ph.
00:07
In some cases something is given and you have to find out the unknown one and then you have to classify them whether the solution is acidic, basic or neutral.
00:17
So, in the first one hydronium ion concentration is given and we know oh - ion concentration how to calculate oh - ion concentration equal to ionic product of water divided by hydronium ion concentration ionic product of water is 1 multiplied by 10 to the power minus 14 divided by 5 .3 multiplied by 10 to the power minus 3 which is equal to this 1 .9 nearly multiplied by 10 to the power minus 12.
00:47
So this is 1 .9 multiplied by 10 to the power minus 12.
00:51
Ph equal to you know ph equal to negative logarithm of hydronium ion concentration which is equal to here negative logarithm of 5 .3 multiplied by 10 to the power minus 3 which is equal to it is nearly 2 .3.
01:16
So ph is nearly 2 .3 since ph is less than 7 you see it is acidic.
01:25
Then the second one is oh - ion concentration is given and you have to find out hydronium ion concentration proceeding in the similar way.
01:39
Hydronium ion concentration equal to kw is 10 to the power 1 multiplied by 10 to the power minus 14 divided by oh - ion concentration is 2 multiplied by 10 to the power minus 8.
01:54
So 1 by 2 means 0 .5 multiplied by 10 to the power 14 minus 8 means 6 or it is in scientific notation 5 .0 multiplied by 10 to the power minus 7...