Which intermolecular force(s) would be present between molecules of HCl and H2O when they are mixed together?

• A. Ion-dipole interactions
• B. Only dipole-dipole interactions
• C. Only London dispersion forces
• D. Hydrogen bonding and dipole-dipole interactions

Answer: (D)

Verified step by step guidance

1. Identify the types of molecules involved: HCl is a polar molecule with a dipole moment, and H2O is a polar molecule capable of hydrogen bonding due to its O-H bonds.
2. Recall the main types of intermolecular forces: London dispersion forces (present in all molecules), dipole-dipole interactions (between polar molecules), hydrogen bonding (a special strong dipole-dipole interaction involving H bonded to N, O, or F), and ion-dipole interactions (between ions and polar molecules).
3. Determine which forces exist between HCl molecules: since HCl is polar but does not have H bonded to N, O, or F, it exhibits dipole-dipole interactions and London dispersion forces.
4. Determine which forces exist between H2O molecules: H2O molecules exhibit hydrogen bonding (due to O-H bonds), dipole-dipole interactions, and London dispersion forces.
5. Analyze the interactions between HCl and H2O molecules: since HCl is polar and H2O can hydrogen bond, the main intermolecular forces between them are dipole-dipole interactions and hydrogen bonding (because the H in H2O can interact with the Cl in HCl), but ion-dipole interactions are not present as there are no ions.