Question

The following substances dissolve when added to water. Classify the substances according to the strongest solute-solvent interaction that will occur between the given substances and water during dissolution.
1.ion-ion forces

2.dipole dipole forces

3.ion dipole forces

4.london dispersion forces



A. HF

B.CH3OH

C.CaCl2

D. FeBr3

Answer 1

Answer: HF-dipole- dipole interaction

CH3OH- dipole-dipole interaction

CaCl2- ion-ion interaction

Explanation:

Both CH3OH and HF possess permanent dipoles which interact with water leading to the dissolution of the above named substances. Remember that water also possesses a permanent dipole. Which can interact with the dipoles on other polar molecules. CaCl2 is purely ionic and interacts with water via ion-dipole mechanism.