"Purification of coarse salt" PPT courseware 2

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"Purification of coarse salt" PPT courseware 2

Questions allowed

When you see the topic of "Substance Purification", do you have any questions?

Students: 1) What is purification?

2) Why purify?

3) How to purify?

4) Purify the instruments learned

purity of substance

Pure substance: a substance, such as distilled water, etc.

Mixture: a variety of substances, such as seawater, rainwater, river water, etc.

Purity of a substance: the mass/substance of the main ingredient

Identify tap water and distilled water [Demonstration experiment]

think about it

Are the substances we have studied pure or mixtures?

1. Marble 7. Alcohol

2. Clarified lime water 8. Disinfecting alcohol

3. Air 9. Water

4. Oxygen 10. Ice and water mixture

5. Mineral water

6. Dilute hydrochloric acid

Use of electronic balance

1) For general solids, use weighing paper and reset to zero

2) For corrosive or easily deliquescent solids, use glassware, such as small beakers, watch glasses, etc. Return to zero again

filter

One stick: refers to the filter paper sticking to the inner wall of the funnel

Second low: means that the filter paper should be lower than the height of the funnel; the liquid level should be lower than the height of the filter paper.

Three leanings: means that the beaker for pouring liquid is close to the glass rod; the glass rod is close to the third layer of the filter paper; the end of the funnel neck is close to the inner wall of the liquid-contacting beaker.

Filtration – A method of separating insoluble solids and liquids.

think about it

How did the little boy in the story carry the salt past the enemy level?

Answer: Dissolve table salt in water

Soak the cotton-padded jacket in salt water and lead it through the enemy level

Squeeze salt water out of cotton-padded jacket

evaporated table salt

Evaporation precautions

1. The solution injected into the evaporating dish cannot exceed 2/3 of the volume of the evaporating dish;

2. Stir while heating to prevent local overheating and solution splashing;

3. When there are more solutes precipitating into crystals in the evaporating dish, the heating should generally be reduced or stopped to allow the residual heat to evaporate to prevent the crystal particles from splashing.

Coarse salt purification steps:

1. Weigh 2.5 grams of coarse salt and add it to the beaker;

2. Measure 8 ml of water and pour it into the beaker.

The role of glass rod

In the process of purifying coarse salt, glass rods are used four times. Please tell me the different functions of glass rods:

1. Dissolution - speed up dissolution

2. Filtering - traffic diversion

3. Evaporation - prevent local overheating and cause liquid to splash

4. Transfer the salt to a fixed container

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"Purification of Coarse Salt" PPT courseware:

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Update Time: 2024-11-17

This template belongs to Chemistry courseware Hunan Education Edition Ninth Grade Chemistry Volume 2 industry PPT template

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