00:01
If we are going to compare ksp values directly to estimate the solubilities, then they need to have the same number of ions.
00:09
So lead chromate, i assume they mean lead 2 chromate, is pbcro4 that produces two ions, one chromate and one lead.
00:21
So we could compare that directly with c, iron 2 sulfide, which produces two ions and that's it.
00:34
And then for the next one we've got manganese 2 hydroxide.
00:39
Manganese 2 has a 2 plus charge, hydroxide has a 1 minus, so we'll need two of them.
00:45
So when this dissociates it creates three ions, one mn2 plus and two hydroxides.
00:51
So we could compare that to anything that also produces three ions zncn2, pbi2 and dpboh2, all those producing three ions.
01:17
To write the ksp expression for lead chromate, we recognize that it separates into its two ions.
01:27
So ksp will be equal to the pb2 plus concentration multiplied by the chromate concentration...