What two things can dissolve in water?

What Dissolves in Water? Salt and Sugar Do

Water is often called the "universal solvent" because of its remarkable ability to dissolve many substances. Among the most familiar are salt and sugar—two everyday kitchen staples that vanish into water, leaving behind a uniform mixture known as a solution.

When you stir table salt (sodium chloride) into a glass of water, the water molecules pull apart the sodium and chloride ions, dispersing them evenly. The same thing happens with sugar, though instead of breaking into ions, sugar molecules remain intact but separate from one another, spreading throughout the liquid. In both cases, the result is a clear, homogeneous solution—no visible particles, just a subtle change in taste.

The science behind this lies in polarity. Water molecules are polar, meaning they have a slight positive charge on one end and a negative on the other. This polarity allows them to attract and surround charged or polar substances like salt and sugar, effectively dissolving them. Nonpolar substances, like oil, don’t mix as easily because they don’t respond to water’s electrical pull.

It's worth noting that while both salt and sugar dissolve, they do so at different rates and to different extents. Sugar is more soluble in hot water than in cold, and salt also dissolves better with increased temperature, though not as dramatically. This behavior plays a role in cooking, chemistry, and even how our bodies absorb nutrients.

So next time you stir honey into tea or sprinkle salt into boiling pasta water, remember—you're witnessing a simple but fundamental process of chemistry happening right in your kitchen.