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Video Source: www.youtube.com/watch?v=ICYNtiU7r6I
For cool and safe experiments to do at home sign up to MEL Science here: http://bit.ly/2yZLi75 • It’s a familiar situation: you go camping with friends, and you don’t have enough water. In this experiment, you’ll find out how to purify water from the nearest pond, You only need a plastic bottle, sand and a few burnt logs. • Safety precautions • Be sure to boil the water after filtration. Water may contain heavy metals, so it is recommended for utility purposes, and should only be drunk in extreme necessity. • Reagents and equipment: • charcoal (100 g); • sand (300 g); • plastic bottle with a lid; • stationery knife; • cotton wool; • awl. • Step-by-step instructions • Cut the bottom off the plastic bottle. Unscrew the lid of the bottle, make a hole in it with the awl and place cotton wool in the lid. Close the bottle and turn it upside down. Place layers of sand and charcoal in the bottle. The more layers, the better the purification will be. The filter is ready! • Processes description • Dirty water contains many organic and mineral impurities, and also various insoluble particles of dust and earth. The sand purifies the water of insoluble particles. Charcoal has good adsorption and so adsorbs organic and mineral impurities. However, this filter has a considerable drawback: it does not purify the water from bacteria and heavy metals. So after filtration the water should be boiled well.
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