00:01
So in this video we're going to be answering question 126 from chapter 17, which tells us that gout, a condition that results in joint swelling and pain, is caused by the formation of sodium uric -urite crystals within tendons, cartilage, and ligaments.
00:15
Sodium urate precipitates out of blood plasma when uric acid levels become abnormally high.
00:20
This sometimes happens as a result of eating too many rich foods and consuming too much alcohol, which is why gout is sometimes referred to as the disease of kings.
00:27
If the sodium concentration in blood plasma is 0 .14 molar and ksp for sodium urate is 5 .76 times 10 to the negative 8, what minimum concentration of urate would result in precipitation? so we're given the concentration of one of our ions and we're given the ksp for our solid and we're asked with the concentration of the other, what concentration of the other ion would result in precipitation.
00:55
So let's talk about when we would form a precipitate.
00:58
So when we have more ions in solution, then there wouldn't be at equilibrium.
01:03
More of our solid reactant must be formed in order to reach equilibrium, which causes a precipitate to form.
01:10
So if we consider sodium urate dissociating into na plus and urate ions, which i've just written as x minus as a shorthand, then we can write our expression for the ksp is sodium times urate ion, concentrations, and that's if those concentrations are at equilibrium.
01:30
But we can also calculate this same expression, which we're going to call our reaction quotient when we're away from equilibrium...