"How to Make Water Clear" Drinking Water PPT Courseware

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"How to Make Water Clear" Drinking Water PPT Courseware

Precipitation

Experiment: Take a cup of muddy water and let it sit for 5 minutes to see if anything sinks to the bottom of the cup. _________If you add a little alum or activated carbon to the mud water, let it sit for 5 minutes, and observe the changes in the size of the solid particles that sink to the bottom of the cup. ________.

Coagulant: alum, activated carbon

What is the function of coagulant?

It can cause suspended impurities in the water to condense into larger particles and slowly sink to the bottom of the water.

What effect does precipitation method have on water purification? what are its disadvantages

It can cause suspended impurities in the water to condense into larger particles and slowly sink to the bottom of the water, but it cannot remove these precipitates.

Scientific scenario: We know that the water of the Yellow River is a bowl of water and half a bowl of sand;

Afterword: Fetching water from a bamboo basket - all in vain

Discussion: Will using a bamboo basket to draw water from the Yellow River be in vain? Why?

How to make the same bamboo basket flow into the Yellow River so that more sand remains in the bamboo basket?

You can put a piece of cloth in the bamboo basket

filtering method

1. Make a filter

Instruments: filter paper, beaker, glass rod, iron stand, funnel

2. Watch filtered mud water

Watch the filter carefully. What did the international students put on the filter paper? ______What happened to the muddy water? ______.

Discussion: What should we pay attention to during the filtering process?

Abbreviations: "One Tie", "Two Lows", "Three Reliances"

One-stick: refers to the filter paper sticking to the inner wall of the funnel. Moisten it with water when sticking tightly so that no air bubbles are left between the inner wall of the funnel and the filter paper.

Second low: the edge of the filter paper is slightly lower than the edge of the funnel; the liquid level in the funnel is slightly lower than the edge of the filter paper (to prevent the filtrate from seeping between the filter paper and the wall)

Three supports: the lower end of the funnel should be close to the inner wall of the beaker (to prevent droplets from splashing); the glass rod should be lightly leaned against one side of the three-layer filter paper; the mouth of the poured beaker should be lightly leaned against the glass rod (for drainage)

Discussion 1: What substances can be separated by filtration?

A solid that is insoluble in water (or two solids, one soluble and the other insoluble) can be added to a liquid

Discussion 2: What are the advantages and disadvantages of filtration in the process of purifying water?

Filtration can remove substances that are insoluble in water, but it cannot remove substances that are dissolved in water.

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"How to Make Water Clear" Drinking Water PPT Courseware 2:

"How to Make Water Clear" Drinking Water PPT Courseware 2 How to treat a glass of turbid natural water? Method 1: Let the water in the beaker stand for a period of time to allow some insoluble solid impurities in the water to settle, and then use some method to separate the solids from the water. ..

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Update Time: 2024-11-22

This template belongs to science courseware E-education edition third grade science volume 1 industry PPT template

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