00:01
First we need to write the balanced chemical reaction.
00:05
Barium hydroxide reacts with two moles of hcl for every mole barium hydroxide to produce one mole barium chloride and two moles of h2o.
00:22
So in this titration curve, the equivalence point corresponding to this volume here that they tell us is 20 milliliters is referring to kind of let's see we are adding says titrated with hcl so this is this is all messed up but if we're titrating with hcl then that means our titration curve should look like this.
01:04
Either way i think they wanted us to use 20 milliliters as the equivalence point volume.
01:13
So to calculate then the concentration of hcl we need to know two things.
01:21
We need to know the moles hcl and we need to know the volume of the hcl solution in liters.
01:32
The moles of hcl can be determined from the barium hydroxide information.
01:40
We have 25 milliliters of the barium hydroxide that's 0 .025 liters at a concentration of 0 .1 moles per liter.
01:53
That gives us moles barium hydroxide but the stoichiometry is one to two so two moles hcl are required for every one mole barium hydroxide...