Investigate how well common salt dissolves in different solvents, such as water, vinegar, and oil. Compare the solubility of salt in each solvent and record your observations.
Salt (sodium chloride) dissolves best in water, moderately in vinegar, and does not dissolve in oil.
Water is an excellent solvent for ionic compounds like salt because its polar molecules can surround and separate the sodium and chloride ions.
Vinegar (dilute acetic acid) also contains water, so salt can dissolve in it, though the presence of acetic acid may slightly affect the solubility.
Oil is non-polar and cannot interact with the ionic bonds in salt, so salt does not dissolve in oil—this demonstrates that solubility depends on the nature of both the solute and the solvent.
Explanation
This investigation relates to the chapter's discussion of solutes, solvents, and solutions. The chapter mentions that water is considered a good solvent, and this activity demonstrates why—water's molecular structure allows it to dissolve many ionic and polar substances effectively. The comparison with oil shows that not all liquids can dissolve the same solutes.
Solution Steps
Salt (sodium chloride) dissolves best in water, moderately in vinegar, and does not dissolve in oil.
Water is an excellent solvent for ionic compounds because its polar molecules surround and separate sodium and chloride ions.
Vinegar contains water, allowing salt to dissolve, though acetic acid may slightly affect solubility.
Oil is non-polar and cannot interact with ionic bonds in salt, preventing dissolution.
Solubility depends on the nature of both the solute and the solvent.