00:01
In this video, we want to determine the solubility product constant, ksp, for iron 3 hydroxide, given some solubility data.
00:07
So let's first write the ionization equation, double arrow because it's only slightly soluble.
00:13
This is going to form, this 3 indicates that the charge on iron is 3 +, and then hydroxide is oh-, subscript becomes the coefficient.
00:23
Coefficient.
00:24
So in a saturated solution, ksp is the product of the concentrations of the ions, each raised to an exponent equal to their coefficient.
00:34
So fe3 plus times oh minus to the third.
00:40
Now we're told that the solubility, which we'll call s, is in a saturated solution 0 .4567 grams of feoh3 in every 450 milliliters of water.
00:56
Let's convert this to molar solubility.
00:59
So grams to moles...