"Purification of Water" Water in Nature PPT Courseware 4

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"Purification of Water" Water in Nature PPT Courseware 4

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 in water plants

Alum (KAl(SO4)2·12H2O): adsorbs impurities suspended in water

Activated carbon: removes soluble impurities, adsorbs color and odor

Adsorption, precipitation, and filtration are commonly used methods in industry and are also common methods for separating mixtures in chemical experiments.

Please think carefully before answering:

1. The filter paper must be tightly attached to the funnel without leaving any air bubbles (why?)

If there are bubbles, the filtration speed will be slower.

2. The edge of the filter paper is lower than the edge of the funnel (why?)

Prevent liquid from flowing out of the funnel

3. Is the filtered water pure water? No, it also contains soluble substances

4. What impurities are mainly removed from water by filtration operation? Remove insoluble impurities

[Summary] Methods to remove insoluble impurities: precipitation and filtration.

[Question] What are the possible reasons why the filtrate is still turbid after filtration?

(1) The filter paper is damaged;

(2) The edge of the filtrate is higher than the edge of the filter paper;

(3) The instrument is not clean, etc.

At this time, if the filtrate is turbid, it should be filtered again until it is clear.

Question: The filtered water is clear but red. How to remove color?

Filter liquids with adsorbent solids.

The function of the adsorbent is to remove soluble impurities, color and odor.

Charcoal and activated carbon have adsorption properties. The activated carbon layer can not only filter out insoluble impurities, but also use its strong adsorption properties to absorb gases (pigments) and soluble impurities to remove odors.

Question: Is the water you get now safe to drink?

No, we mainly remove insoluble impurities, and there are many soluble impurities in the water. For example, the water here is prone to scale.

2. Hard water and soft water

1. Concept

Hard water: Water containing more soluble calcium and magnesium compounds.

Soft water: Water with no or less soluble calcium and magnesium compounds.

2. Inspection methods (1) Soap water (2) Evaporation method

3. Dangers of hard water:

Waste of soap, clothes will not be washed properly;

Boiler scaling poses a risk of explosion.

4. Methods for softening hard water:

Industry - ion exchange method and pharmaceutical method

In life - boiling

Laboratory - Distillation

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For more information about the PPT courseware "Water Purification of Nature's Water", please click on the "Water Purification ppt Nature's Water ppt" tag.

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Update Time: 2024-10-17

This template belongs to Chemistry courseware People's Education Press Ninth Grade Chemistry Volume 1 industry PPT template

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