acid dissociation Ka

[sivavajc]

Does anyone remember the short hand way that kaplan teaches to calculate Ka? They give some kind of example in the side margin: if you have a compound MX
ka=X^2
and if you have MX2 then Ka=???
and if you have M2X3 then ka = ???

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[americanpierg]

Does anyone remember the short hand way that kaplan teaches to calculate Ka? They give some kind of example in the side margin: if you have a compound MX
ka=X^2
and if you have MX2 then Ka=???
and if you have M2X3 then ka = ???

That's not Ka, thats Ksp. I find it easier to think it out.

MX = [y][y] = y^2
MX2 = [y][2y]^2 = 4y^3
MX3 = [y][3y]^3 = 27y^4
M2X3= [2y]^2[3y]^3 = 108y^5


this way you can work it out for all of them