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

FREE Expert 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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Problem Details


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?

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Intermolecular Forces concept. You can view video lessons to learn Intermolecular Forces. Or if you need more Intermolecular Forces practice, you can also practice Intermolecular Forces practice problems.

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Based on our data, we think this problem is relevant for Professor Enderle's class at UCD.