Task 2: Interaction between salt with water molecules

Here is our group video to explain interactions between H₂O molecules and  salt (NaCl) when it dissolved in the water. Please wear your earphone and enjoy our video with your best mooooooood…

Before I did this task, I only know that salt can dissolve in water without knowing any theory behind it. After doing some learning, I found that both water molecules and salt compounds are polar. This is due to their positive and negative charges on opposite sides in the molecules. Therefore, salt dissolves in water due to these electrical charges.  Ionic bond is found in salt compound (NaCl) as chloride ion (Cl^–) is negatively charged and sodium ion (Na⁺) is positively charged.

However the water molecule is ionic in nature, but the intramolecular force is covalent bond. Water molecule is with 2 hydrogen atoms both situating themselves with their positive charge on one side of the oxygen atom, which has a negative charge. When salt is mixed with water, the salt dissolves because the covalent bonds of water are stronger than the ionic bonds in the salt molecules.

The positively-charged side of the water molecules are attracted to the negatively-charged chloride ions and the negatively-charged side of the water molecules are attracted to the positively-charged sodium ions. Water molecules pull the sodium and chloride ions apart, breaking the ionic bond that held them together. After the salt compounds are pulled apart, the sodium and chloride atoms are surrounded by water molecules. Hydrogen bond is formed between water molecule and salt compound. Once this happens, the salt is dissolved, resulting in a homogeneous solution.