Lesson 3 of 13
How much will go in
Show on a big screenAdd salt to a glass of water, one spoon at a time. Stir each time. Where does it stop?
Step 1 of 3
- One spoon dissolves.
- In this glass, six spoons all dissolve.
- The seventh stays at the bottom.
Dissolving stops at a limit. At this temperature, the water cannot hold more salt.
New word
- Solubility — the most solute a solvent can hold at one temperature.
The rule
At one temperature, a solvent has a limit. A fixed amount dissolves only so much solute. This maximum is its . Any extra solute stays undissolved.
Twice the water takes twice the solute at the same temperature. The limit of six spoons here is a made-up number.
Watch out!
Stirring does not raise the limit. It only makes the solute dissolve faster.
Add spoons. Watch for the pile.
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Try the lab to finish this lesson.