"Several Important Salts" PPT (first lesson)

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"Several Important Salts" PPT (first lesson)

Part One Content: Learning Objectives:

1. Understand the difference between table salt and salt.

2. Understand the main properties and uses of the three salts NaCl, Na2CO3, and CaCO3.

3. Master the identification method of CO32-.

Several important salt PPT, part 2 content: What is salt

What is salt? Does salt just mean table salt?

1. Salt is the product of the reaction between acid and alkali

When acids and bases react, the substances produced (except water) can be called salts, which are a huge class of substances.

alum stone

Alunite is an important chemical raw material and can be used to prepare alum, aluminum sulfate, potassium sulfate, etc. The chemical formula of alum is KAl(SO4)2·12H2O (salts containing two cations are called double salts), the chemical formula of aluminum sulfate is Al2(SO4)3, and the chemical formula of potassium sulfate is K2SO4. They all belong to salts. Alunite [KAl3(SO4)2(OH)6] is a mineral that is white (naturally with light gray, light yellow and other colors due to impurities), has glass luster, and is difficult to dissolve in water. The proven alunite reserves in Zhejiang Province account for more than 50% of the country, especially in Fanshan, Cangnan County, Wenzhou City. The alunite reserves are approximately 167 million tons, containing 45.4%~47.71% of pure alunite. It is the largest proven alunite reserve in the world so far. Largest alunite mine.

Several important salt PPT, the third part: classification of salt

1. Normal salt NaCl K2SO4 CaCO3

Normal salt is the product of the complete neutralization reaction of acid and base

2. Acid salt NaHCO3 KHSO4

Acid salts are the products of partial neutralization reactions of acids

3. Basic salt Cu2(OH)2CO3

Basic salts are the products of partial neutralization reactions with bases

Several Important Salts PPT, Part 4: Several Important Salts

(1) Sodium carbonate Na2CO3

1. Appearance: White powdery solid

2. Common names: soda ash, soda

3. Sodium carbonate crystal: Na2CO3 • 10H2O

4. Crystal Weathering

In dry air at normal temperature, Na2CO3·10H2O will gradually lose crystal water and become sodium carbonate powder.

5. The aqueous solution of sodium carbonate is alkaline.

Therefore, it is commonly known as "soda ash"

Soda ash is not an alkali but a salt.

What are the uses of using the alkalinity of sodium carbonate?

Utilize the alkalinity of sodium carbonate for steaming steamed buns and cooking porridge. Detergent making, paper making, textile industry applications, etc.

(2) Calcium carbonate CaCO3

1. Properties and existence: Calcium carbonate is an insoluble salt.

It is the product of the neutralization reaction of carbonic acid (H2CO3) and calcium hydroxide.

2. Testing of carbonate ions (CO32 _):

Adding dilute hydrochloric acid solution generates gas that turns clear limewater cloudy.

Several Important Salt PPT, Part 5: Classroom Exercises

1. Which of the following statements is correct ( )

A. Salt can be eaten, so it is called table salt.

B. Salt is table salt, easily soluble in water

C. Salt has a salty taste and is white crystal

D. Salt is a general term for a class of substances

2. Which of the following substances belongs to salt ( )

A. Soda ash B. Caustic soda C. Hydrochloric acid D. Hydrated lime

3. Which of the following statements about sodium carbonate crystals is wrong ( )

A. It can remove oil stains and can be used as a kitchen cleaner.

B. Sodium carbonate crystals are easily weathered in dry air

C. Sodium carbonate crystal is an alkali

D. Add dilute hydrochloric acid dropwise to a small amount of sodium carbonate crystals, and a small amount of bubbles will come out.

4. To remove scale on the inner wall of a thermos bottle, the reagent that should be used is ( )

A. Dilute hydrochloric acid B. Caustic soda solution

C. Lime water D. Salt water

5. There are two bottles of colorless liquid, one of which is distilled water and the other is concentrated salt water. There are many ways to distinguish them. Please list several ways to distinguish (no tasting method).

(1) Method using evaporation: Salt can crystallize during evaporation.

(2) Taking advantage of the different densities of the solutions, immerse the eggs in them to see how they sink and float.

(3) Use a balance to measure the mass of the solution of the same volume by taking advantage of the different densities of the solutions.

(4) Use the different conductivities of solutions to measure their conductivity. Salt water can conduct electricity;

(5) You can add AgNO3 solution dropwise to see if there is a white precipitate. The salt water reacts with the AgNO3 solution to form a white precipitate.

Keywords: Zhejiang Education Edition ninth grade science PPT courseware free download, several important salt PPT download, .PPT format;

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"Several Important Salts" PPT courseware:

"Several Important Salts" PPT courseware Part 1: What is salt? Question: Is salt table salt? Scientifically speaking, salt refers to a type of compound containing metal ions (including ammonium ions) and acid ions. Sodium chloride: NaCl = Na+ + Cl..

"Several Important Salts" PPT (Lesson 3):

"Several Important Salts" PPT (Lesson 3) Part One: Learning Objectives: 1. Understand the types and characteristics of chemical fertilizers. 2. Remember the composition characteristics of ammonium salts and the chemical properties and testing methods of ammonium salts. 3. Understand the properties of some common salts through experiments. ... ... ....

"Several Important Salts" PPT (second lesson):

"Several Important Salts" PPT (Second Lesson) Part One Content: Learning Objectives: 1. Learn to use the solubility tables of some acids, bases, and salts; 2. Know the metathesis reaction and understand the conditions of the metathesis reaction; 3. Understand Chemical properties of salt and preparation of salt..

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Update Time: 2024-08-06

This template belongs to science courseware Zhejiang Education Edition Ninth Grade Science Volume 1 industry PPT template

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