Number 49 please!!! 48. Which statements about the collision theory of reactions

Question

Number 49 please!!!

48. Which statements about the collision theory of reactions are correct? I.Molecules must have the correct spatial orientations for collisions to lead to reactions. II. Only collisions with an energy greater than a certain threshold lead to reactions. (AlIonly (B) Il Only(C) Both l and(D) Neither I nor lI 49. Which of the following has the greatest solubility in water? (A) Zncro, (K,,-2.7× 10-8) |(C)CaF2(Nm= 3.9 × 10-11) (B) BacrOu4K,,-2.3 × 10-10) (D) AgBr(R,p = 5.0 x 10-13) -

Explanation / Answer

The salt dissolves as:

ZnCr2O4 <----> Zn2+ + Cr2O42-

   s s

Ksp = [Zn2+][Cr2O42-]

2.7*10^-8=(s)*(s)

2.7*10^-8= 1(s)^2

s = 1.643*10^-4 M

The salt dissolves as:

BaCrO4 <----> Ba2+ + CrO42-

   s s

Ksp = [Ba2+][CrO42-]

2.3*10^-10=(s)*(s)

2.3*10^-10= 1(s)^2

s = 1.517*10^-5 M

The salt dissolves as:

CaF2 <----> Ca2+ + 2 F-

   s 2s

Ksp = [Ca2+][F-]^2

3.9*10^-11=(s)*(2s)^2

3.9*10^-11= 4(s)^3

s = 2.136*10^-4 M

The salt dissolves as:

AgBr <----> Ag+ + Br-

   s s

Ksp = [Ag+][Br-]

5*10^-13=(s)*(s)

5*10^-13= 1(s)^2

s = 7.071*10^-7 M

The compound with maximum solubility is:

CaF2

Answer: CaF2

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