April 27

What dissolves in water?

What dissolves in water?

  • Baking soda
  • Sugar
  • Salt
  • Coffee

Things that dissolve in water are soluble. Temperature can affect solubility. As water molecules heat up, they start to vibrate faster and can better break apart what’s being dissolved. A real-life example of this is that sugar dissolves better in hot water, than in cold water. Pressure also affects solubility but not by much. It only really affects gaseous solutes. For example, carbonated drinks. When you open a can of pop, you get the hissing sound because the contents are being put under pressure so that they stay carbonated. Finally, things will dissolve best in a liquid that has a similar chemical structure. That’s called polarity. For example, sugar will dissolve very nicely in polar water rather than benzene, a non polar solvent.



½ water (10ml) ½ rubbing alc (10ml) ¼ water (5ml) ¼ rubbing alc (5ml)
Salt 0.45 g 0.45 g 0.45 g 0.45 g
Sugar 0.45 g 0.45 g 0.45 g 0.45 g
Salt It dissolved. It didn’t dissolve. It dissolved but there were some bits of salt left. It didn’t dissolve.
Sugar It dissolved. It started clumping. It dissolved. Started clumping.


½ alcohol with sugar

½ water with sugar

½ alcohol with salt

½ water with salt

¼ alcohol with salt

¼ water with salt

¼ alcohol with sugar

¼ water with sugar