SCIENCE Chapter V : Water and

SolutionSubtopic v.vi : Water Purification

What is Water Purification and the Method

Natural sources of water contain all types of impurities . This water is not suitable for drinking .

Water from natural sources needs to be purified so that it is safe for drinking .

What is Water Purification ?

Natural sources of water include :- Rain Water- Spring Water- Well Water - River Water - Lake Water- Pond Water- Seawater

Natural Sources of Water

Water from the natural sources often contain impurities such as :

- Microorganism- Suspended substances- Dissolved substances- Decomposed substances- Silt

Impurities

Natural Sources and It’s Content

Natural Sources of Water

Content

Rain Water - The purest form of water- Contain dust , dissolve gases and microorganism

Spring and Well Water

- Originate from rain water that seeps through the layer of soil

- Contain Microorganism and mineral saltsRiver and Lake Water

- Not clean- Contain a lot of impurities such as decomposed

substances , silt , Microorganisms and mineral salts .Pond Water - More dirty than river water

- This is because pond water does not flow freelySea Water - Contains a lot of dissolved mineral salts ; contain

Microorganism and rubbish

There’s a few method to filter the water .

a) Filtrationb) Chlorinationc) Boilingd) Distillation

Method of Water Purification

A filtration funnel is used to filter the water Filtration can only remove impurities such as

suspended substances . The filtered is not safe for human

consumption because the water still contains Microorganism and dissolved substances

What is Filtration ?

The Example of Sand Filter It including :- Muddy Water - Fine Sand- Coarse Sand- Pebbles- Stones

This is the simplest method of producing water that is fit for drinking

Boiling kills all dangerous Microorganism but it cannot remove all impurities and dissolved material .

What is Boiling ?

Chlorination method can kills all the Microorganism but it can not kills all impurities and dissolve substances .

Excess chlorination can be a hazard to human health because chlorine is poisonous . Use in a recommended quantity .

Chlorination is an easy method of purifying water in a large quantity usually at the purification plants .

What is Chlorination ?

CholorineChlorine is a chemical element with CI symbol and atomic number 17 . Chlorine is a halogen group and is the second lightest halogen than flourineIt’s formed diatomic molecules .

Atomic Number : 17Atomic mass : 35.453 ± 0.002 uElectron Configuration : Ne 3s2 3p5Discoverer : Sir Carl Wilhelm ScheeleDiscovered : 1774

Distillation is a process where water is boiled until it becomes steam ( vapour ) .

The steam produced is then condensed to form pure water known as distilled water .

What is Distillation ?

Distilled water is free from suspended particles , Microorganisms and dissolved substances

Distilled water is not suitable for drinking because it’s does not contain any dissolved mineral salts that is need by our body

Distilled water is tasteless and is not nice to drink .

Distilled Water ? What’s that ?

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