Question

Please answer question 1 and 2 (all parts)

1) Sodium iodide Nal is dissolved in water. There are 3 types of molecules/ions in this solution: molecules of water H O, Na ions and iodide ions, r. Write YES or NO below to indicate whether each intermolecular interaction is present between ions and/or neutral molecules: Hydrogen bonding Dipole-dipole lon-ion lon-dipole London-dispersion Metallic 2) To answer this question, refer to the two tables that you filled above (there could possibly be multiple answers) If dipole-dipole interaction occurs in this solution, what ion or molecule interacts with what ion or molecule? Write their formulas, for instance: C2HsOH interacts with CHsCN: If ion-dipole interactions occur in this solution, what ion or molecule interacts with what ion or olecule? Write their formulas, for instance: CaHsOH interacts with barium cation:

Answer 1

1)

hydrogen bonding	YES
dipole-dipole	YES
ion-ion	YES
ion-dipole	YES
london dispersion	NO
metallic	NO

2) a) dipole-dipole interaction basically occurs between the molecules having permanent dipoles. for example water. the molecular structure of water is simply a tetrahedral one. two arms contain H and other two contains lone pairs of oxygen. thus the dipole dipole interaction occurs between water molecules itself.

b) ion-dipole interaction occurs between the naked ion and the water molecule which is trying to stabilize the ion in the aqueous medium by providing a hydration sheath surrounding the cation and anion. thus ion-dipole occurs between molecules of Na+ (sodium ion) and water. and also within I- (iodide ion)and water.