What Are Soluble Impurities?

• Soluble impurities are substances that can dissolve in a liquid, like salt in water.

Why Remove Soluble Impurities?

• We want to remove soluble impurities to make the liquid cleaner and safer to use or drink.

1. Filtration
   • Filtration is a method to remove solid impurities from a liquid.
   • It uses a filter or a sieve to trap the solid particles while letting the liquid pass through.
2. Example: Making Tea
   • When making tea, we use a tea strainer to remove tea leaves (soluble impurities) from the tea.
3. Evaporation
   • Evaporation is a way to remove the liquid from a solution and leave the solid impurities behind.
   • For example, if you have a salty solution, you can heat it to make the water evaporate, leaving the salt behind.
4. Distillation
   • Distillation is a method to separate different liquids in a mixture based on their boiling points.
   • This is used to purify water by boiling it and collecting the steam, which leaves impurities behind.
5. Crystallization
   • Crystallization is a process where we let a solution cool and form crystals.
   • The crystals are pure, and we can separate them from the impurities.
6. Using Tools
   • We can use tools like filters, sieves, strainers, and heating equipment to remove soluble impurities.
7. Safety
   • Always be safe when handling chemicals or hot substances. Use adult supervision when needed.
8. Everyday Examples
   • Removing sand from water at the beach.
   • Making sugar crystals from a sugar-water solution.

Let’s practice!