Water can dissolve many substances because-
it has a partial charge on each side of its molecules
it has a linear molecular shape
it has a nonpolar molecular structure
it has the molecular formula H₂O
The Correct answer and Explanation is:
The correct answer is “it has a partial charge on each side of its molecules.”
Explanation:
Water (H₂O) is often referred to as the “universal solvent” because of its remarkable ability to dissolve a wide variety of substances. This property stems primarily from its molecular structure and polarity. Each water molecule consists of two hydrogen atoms covalently bonded to a single oxygen atom. The oxygen atom is more electronegative than hydrogen, meaning it attracts the shared electrons in the covalent bonds more strongly.
As a result of this unequal sharing of electrons, the oxygen atom acquires a partial negative charge (δ-) due to the presence of a greater electron density around it. Conversely, the hydrogen atoms acquire a partial positive charge (δ+). This creates a polar molecule, where one side (the oxygen end) is slightly negative, and the other side (the hydrogen ends) is slightly positive.
The polar nature of water allows it to interact effectively with other polar and ionic substances. When a substance, such as salt (NaCl), is introduced to water, the partially positive hydrogen atoms are attracted to the negatively charged chloride ions (Cl⁻), while the partially negative oxygen atoms are attracted to the positively charged sodium ions (Na⁺). This interaction facilitates the breaking apart of the ionic bonds in the salt, resulting in the dissociation of Na⁺ and Cl⁻ ions in solution.
In contrast, nonpolar substances do not dissolve well in water because they lack charged regions to interact with the polar water molecules. Water’s ability to form hydrogen bonds further enhances its solvent properties, allowing it to surround and stabilize dissolved ions and polar molecules effectively.
In summary, the unique partial charges on water molecules enable it to dissolve a wide range of substances, making it an essential component in biological and chemical processes. This property is crucial for life, as it facilitates the transport of nutrients, waste, and other essential compounds in biological systems.