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Authoritative PPT Summary
"Purification of Water" The most common liquid - water PPT courseware
1. Pure water and natural water
1. Pure water
It is a colorless, odorless, clear and transparent liquid.
It is a pure substance (chemical formula: H2O)
2. Natural water
River water, lake water, well water, sea water, etc. in nature are often turbid because they contain many soluble and insoluble impurities.
Belongs to a mixture
2. Water purification methods
1. Let stand and settle.
Adsorption precipitation method: Add certain water purification agents such as alum to the water, and use the colloid formed after alum dissolves in water to adsorb impurities and settle the impurities to achieve the purpose of water purification.
2. Filter
(1) Filtration: An operation to separate liquids from solid substances that are insoluble in liquids.
(2) What instruments are needed for filtration operations?
One sticker: The filter paper sticks to the inner wall of the funnel
Second low: The edge of the filter paper is lower than the edge of the funnel and the liquid level is lower than the edge of the filter paper.
Three things to rely on:
The mouth of the beaker is close to the glass rod
The glass rod leans against one side of the three-layer filter paper
The neck of the funnel is close to the inner wall of the beaker
3. Hard water and soft water
1. Concept:
Hard water: Contains more soluble calcium and magnesium compounds
Soft water: no or less soluble calcium and magnesium compounds
2. How to distinguish between hard water and soft water:
(1) Water with scale produced after being heated or left for a long time is hard water.
(2) Add soapy water to the water. Water with few bubbles is called hard water, and water with a lot of bubbles is called soft water.
Self-diagnosis test questions
1. Which of the following mixtures can be separated by filtration ( )
A. Alcohol and water B. Salt and sediment
C. Salt water D. Iron powder and copper powder
2. After natural water undergoes the following purification operations, soft water will definitely be obtained ()
A. Precipitation B. Filtration C. Adsorption D. Distillation
3. Which of the following methods can distinguish between hard water and soft water ( )
A. Observe the color B. Add alum
C. Dissolve salt D. Add soapy water
4. Point out the errors in the picture on the left:
⑴ No glass rod is used for drainage.
⑵The lower end of the funnel is not close to the inner wall of the beaker.
5. What method should be used to remove the following impurities in water:
⑴ Sediment in water: filter.
⑵ Table salt in water: distillation.
⑶ Alcohol in water: distillation.
⑷ Colored and odorous substances in water: adsorption by activated carbon.
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