00:01
A solution that has a hydrochloric acid concentration of 3 .4 times 10 to the negative 3 molar also has a hydronium concentration equal to that value.
00:20
So this is additionally a hydronium concentration.
00:28
So we want to find a solution of hydrofluoric acid with a concentration of hydrofluoric acid that yields a hydronium concentration of 3 .4 times 10 to the negative 3.
00:42
To do that, we use the little equation, k .a.
00:48
For any weak acid is equal to the hydronium concentration that it creates squared, divided by the concentration of the acid, in this case hydrofluic acid, minus the hydronium concentration.
01:04
This is the concentration of hydrofluoric acid.
01:08
That we need to solve for.
01:10
So that means we need to look up k .a for hydrofluoric acid.
01:14
It's not provided, but in the table that i have, it's 7 .2 times 10 to the negative 4...