Page 79 - Active Science 5 Ebook and Activity

Observation : Clear water collects separately in the container and insoluble solid

remains behind in the funnel.
Conclusion : Clear liquid or water is called filtrate and the insoluble solid
substance left behind is called residue.

Filtration in Day-to-day Life

• Vacuum cleaners keeps away dust particles and germs.

• Coffee makers keeps out coffee seeds or grounded coffee particles.

• Taps keep away germs and insects.
Be Eco-friendly!
• Air conditioners trap dust particles. Carry a refillable bottle and a

mug for beverages.

2. Sedimentation and Decantation: In sedimentation, the mixture of impure water
is allowed to stand undisturbed for some time. The impurities after a while will
settle down at the bottom of the container. The substance that settles down is called
sediment. This process is called sedimentation.

The process by which a liquid is carefully poured out leaving behind the sediment is
called decantation.

Activity 6.6
Aim : To demonstrate the process of
sedimentation
Materials Required: Two containers, mud, water
Procedure : • Take a container.

• Put some mud in the container
and wait for a few minutes.

• You will notice that mud has Sedimentation Decantation
settled down at the bottom of
the container slowly. This is called sedimentation.
• Now pour the water slowly and carefully into another container
without disturbing the mud. This called decantation.
Observation : The insoluble substances such as mud being heavier settle down at
the bottom of the container.
Conclusion : The impurities settle down at the bottom of the container because
they are heavier than water.

R emoving Soluble Substances from Water
Soluble substances can be removed from water by evaporation or distillation.

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