00:01
To find the concentration of the hydrofluoric acid, we recognize that the reaction with sodium potassium, sorry, hydroxide is one -to -one, producing potassium fluoride and water.
00:14
So the hf concentration will be the moles of hf divided by the volume of the hf solution.
00:20
The moles of hf can be determined by taking the volume of potassium hydroxide required to neutralize it.
00:28
That's 19 .35 milliliters, which is 0 .01935 liters.
00:37
I converted it to liters so that i could multiply by the molarity of potassium hydroxide, 0 .625 moles per liter to get moles potassium hydroxide.
00:51
Ultimately, to get molarity of hf, i need moles of hf.
00:56
So i'll use the stoichiometry of the balanced chemical renalism.
01:00
Reaction to convert one mole of k -o -h to one mole of hf, this being moles of k -o -h right here...