Polarity:

* Water molecules are bent, with the oxygen atom being slightly negative and the hydrogen atoms being slightly positive.

* This uneven distribution of charge creates a dipole moment, making water a polar molecule.

* Polar molecules like water are attracted to other polar molecules or ions, allowing them to dissolve.

Hydrogen Bonding:

* The slightly positive hydrogen atoms in one water molecule can form weak bonds called hydrogen bonds with the slightly negative oxygen atoms of another water molecule.

* This strong intermolecular force helps hold water molecules together, creating a cohesive network.

* When a polar substance like salt (NaCl) is added to water, the positive sodium ions (Na+) are attracted to the negative oxygen atoms in water, and the negative chloride ions (Cl-) are attracted to the positive hydrogen atoms in water.

* This attraction breaks apart the ionic bonds holding the salt together, allowing the ions to dissolve in the water.

In summary:

* The polar nature of water allows it to interact with and dissolve other polar molecules and ions.

* The strong hydrogen bonds between water molecules further enhance its solvating ability.

This is why water is often referred to as the "universal solvent", although it doesn't dissolve everything!