Chemistry Intermolecular Forces Solution:  Ion-dipole forces. Why does the O side of H2O poi...

Solution:  Ion-dipole forces. Why does the O side of H2O point toward the Na+ ion?

Problem


Positive ends of polar molecules are oriented toward negatively charged anions. A diagram shows a central Cl- forming hydrogen bonds with partially positively charged hydrogens in six surrounding water molecules. Negative ends of polar molecules are oriented toward positively charged cations. A diagram shows a central Na+ forming hydrogen bonds with partially negatively charged oxygens in six surrounding water molecules.


 

Ion-dipole forces.

 



Why does the O side of H2O point toward the Na+ ion?

Solution

We are asked why does the O side of H2O points toward the Na+ ion which exhibits ion-dipole forces.


Recall:

Ion-dipole interaction – occurs between an ion and a polar covalent compound


The ion here is Na+ while H2O is the polar covalent compound as evidenced by the Lewis structure:


Step 1: Determine the central atom in the molecule.

Step 2: Calculate the total number of valence electrons present.

Step 3: Draw the Lewis structure for the molecule.

Step 4: Determine the polarity and IMF of the molecule.


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