Which of the following statements concerning the attraction between ions and pol

Question

Which of the following statements concerning the attraction between ions and polar solvent molecules arc correct? The larger the ion charge, the greater the attraction. The attractive force increases as ionic radii increases. The greater the dipole (of the solvent molecule), the greater the attraction a) 1 only b) 2 only c) 3 only d)1 and 3 e) 1.2, and 3 Answer. d Which solid is likely to be least soluble in water? a) MgBr_2 b) I_2 c) CaCO_3 d) SiO_2 e)C_6H_12O_6 Answer. d What is a primary factor for the low solubility of AgCl(s) in water? a) The lattice energy of AgCl is greater than the enthalpy of hydration for the ions. b) The enthalpy of hydration for CI^- is very exothermic.

Explanation / Answer

Q1.

1. True, according to Coulumbs law, the larger the charge, the stronger the force

2. False, since we actually care about the distance of charges, not the radius

3. True, if dipole (difference in electronegativity, i.e. charges) are large, the interaction isgoing to be great

Q2.

a) MgBr2 is solbule

b) I2 will form HI acid

c) CaCO3, could be, moderately soluble

d) SiO2, is a very covalent specie, this forms crystals so expect

e) C6H12O6 will be moderately soluble

best answer is then D

Q3

AgCl:

a) This is true, since AgCl lattice > hydration of Cl-

b) this is true, the enthalpy of hydraiton is high for Cl- ions

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