i was looking at one of the kaplan flash cards and it says the ksp for the reaction Fe(OH)3--> Fe3+ + 3 OH- is [Fe3+][OH-]^3 but shouldnt it be [Fe3+][3OH-]^3? Since it is MX3= 27x^4 it would have to be (x)(3x^3).
i was looking at one of the kaplan flash cards and it says the ksp for the reaction Fe(OH)3--> Fe3+ + 3 OH- is [Fe3+][OH-]^3 but shouldnt it be [Fe3+][3OH-]^3? Since it is MX3= 27x^4 it would have to be (x)(3x^3).
i was looking at one of the kaplan flash cards and it says the ksp for the reaction Fe(OH)3--> Fe3+ + 3 OH- is [Fe3+][OH-]^3 but shouldnt it be [Fe3+][3OH-]^3? Since it is MX3= 27x^4 it would have to be (x)(3x^3).
If you have the Ksp and you want to solve for x then you would use this equation. You normally use this equation for weak acids and bases. If you have a common ion effect question, you will use the common ion's concentration and whatever is left over. If you have a common ion like OH- = .1 M you will use [x][.1]^3 = Ksp
If you have the Ksp and you want to solve for x then you would use this equation. You normally use this equation for weak acids and bases. If you have a common ion effect question, you will use the common ion's concentration and whatever is left over. If you have a common ion like OH- = .1 M you will use [x][.1]^3 = Ksp
I know its confusing, but there's two different types of situations. If you are given a concentration of the solid (reactant) and asked to find the concentration of a product than you use the coefficient (3x)^3. But if you are given the concentration of one of the ions and asked to find ksp or something than you don't use the coefficient, just the concentration given cubed ([OH-])^3