00:01
All right, so the question here says for each of the salts on the left, does iron 2 sulfide and barium phosphate match the salts on the right that can be compared directly using kirchhoff's p values to estimate solubility? all right, so let's look at it.
00:19
For us to be able to do this, there are two important things that must be established.
00:23
Number one, we must get the correct chemical formula of salt and number two, we must be able to write the correct iron equation for the dissolution of this salt.
00:37
In the first one, we have iron 2 sulfide, that's fes, and the other one, we have barium phosphate, bo3po4 bracket 2.
00:48
Now with the chemical formulas, you can see that most likely the salt on the right that would have similar kirchhoff's p values and we'll be able to use that to compare the solubility, would have similar chemical formula.
01:04
But let me explain what that means in detail.
01:09
So for fes, for example, for iron 2 sulfide, when it ionizes, you have one mole of iron 2 and one mole of the sulfide iron.
01:21
This is aqueous, that is aqueous, and this is solid.
01:25
Now, guess what? the ksp for this is the concentration of iron 2 raised to the power of its coefficient in the equation, which is 1, multiplied by the concentration of sulfide iron raised to the power of its coefficient, which is also 1.
01:43
Now, but the solubility, if the solubility of iron 2 is, of iron 2 sulfide is s, the concentration of this would also be s, and this will be s.
01:53
Hence, the ksp value for this would be s squared...