Question

xercise 14.16 thodynamic 2. The equilibrium constant for the following reaction is called the fluoride: constant for the following reaction is called the "solubility product of calcium CaF2(s) - Ca2+(aq) + 2F (aq) K = K = 3.2 x 10-11 a write an expression for the equilibrium constant of this reaction in terms of concentrations. why do you suppose we call this a solubility product instead of a solubility quotient or ratio (b) Calculate the equilibrium concentrations of Ca? and F- if excess solid CaF2 is placed in water. fields, providing their crop nds that are essential to plus rtilizers: manure and pulver wild ones, including gun on of corn, wheat, and oth arge to be met by traditie and phosphorus come free na synthetic chemistry form ammonia, NHEa compounds derived from (c) In which direction will the equilibrium shift if some NaF is added to the saturated CaF2 solution from part b? [Hint: is NaF soluble in water?) was developed in Germa the ammonia first produs ufacture explosives that ess that sustains human ions of people between 19 (d) Calculate the equilibrium concentrations of Cat and F if enough NaF is added to the saturated CaF2 solution from part b to make the total concentration (prior to re-equilibration) = 0.250 M. (Hint: look for a simplifying approximation! mical reaction: us (AG 0) underst ysts and elevated temp os

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Answer 1

Caf(s) - Ca2+ (aa) + 2F (aa) Kakop -3.2 X10-11 when an lonic solid is dissolved in liquid the aquacous part and solid part remain in equilibrium, and the product of soluble part (solubility) is known as Solubility product. The equilibrium constant is called solubility product because only products of solubility of aquoeus ions are taken into account and not the solid part, Unlike other equilibrium constant where radio of product and reactants are taken. Cakes - Cataas + 25 cases Kop a [Ca 2+] [57² Caris) - Cantoa, + 2t caa) S 23 Ksp = (s) (25) 3.2 Xoll - s3 = 4 3.2 X10-11 4 S = 28x10112 S = 2 x 104 m [cat] = 2x10-4 m [5 ] = 4 x 10-4 M

27 increases Cafs) Cacaq) + 25 aa) Tincreases Backward direction when Nat will added to the solution it will dissociate into Nat and Fions. fion is common and will increase the concentration product of the equilibrium shifting it towards Reactant.

d) Ca fr (s) Cat can) + 2F antial (5) chang (25+0.2496) equilibriu Added at "Kap = (s) (25 +0. 24962 3.2x10 11 = ( ) x (45² +0.99845 + 0.06 0 = 458 +0.998452 +0.0623 S -3,2 xo!! Sa 5.136 XC0-11 M. [Ca 2+] = 5.136 X10M [F-) - 1.027 x 10 10 M