"Acidity and Alkalinity of Matter" PPT (first lesson)

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"Acidity and Alkalinity of Matter" PPT (first lesson)

Part One Content: Learning Objectives:

1. Know that substances are divided into acidic and alkaline substances.

2. Name typical strong acids and common weak acidic substances in life; typical strong bases and common weak alkaline substances in life.

3. Know common acid-base indicators and their corresponding properties.

Acidity and alkalinity of substances, Part 2: Acidic and alkaline substances

1. Acidic substances and alkaline substances

Vinegar is an acidic solution. (Vinegar is not acid)

(Contains weakly acidic acetic acid, which is acidic)

Vinegar and gastric juice are different substances, why do they both smell sour?

Scientists have proven that these solutions are acidic because they contain a special type of substance - acid.

2. Definition of acid

All the cations generated during ionization are hydrogen ion compounds

3.Definition of base

The anions produced during ionization are all compounds of hydroxide ions.

4.Acid solution

① Acid solution is an aqueous solution of acid. All cations are H+

② Acidic solution is a solution containing H+.

③ If the acid solution is acidic, it must be an acidic solution.

④ An acidic solution does not necessarily belong to an acid solution.

5. Common acids and classifications:

Does acid contain oxygen?

Oxyacids:

H2SO4, HNO3, H2CO3, H3PO4, etc.

Name: "A certain acid"

Anaerobic acids: HCl, H2S, HF, etc.

Name: "Hydrogen acid"

Acidity and alkalinity of substances, Part 3: Acid-base indicators

1.Acid-base indicator

Substances that can show different colors in acidic or alkaline solutions are called acid-base indicators, often referred to as indicators.

2. Common acid-base indicators

Litmus test solution (purple) Phenolphthalein test solution (colorless)

blue litmus paper red litmus paper

Acidity and alkalinity of substances, Part 4: Summary

1.Definition of acid

All the cations generated during ionization are hydrogen ion compounds

2. Common acids and classifications:

HCl, H2SO4, HNO3, H2CO3, acetic acid, etc.

3.Definition of base

The anions produced during ionization are all compounds of hydroxide ions.

4. Common bases and classifications:

NaOH, Ca(OH)2, KOH, Ba(OH)2, etc.

5.Acid-base indicator

purple litmus solution

Colorless phenolphthalein test solution

Acidity and alkalinity of substances, Part 5: Practice

1. Which of the following substances is not acid ---- ( )

A. HNO3 B. NaHCO3

C.H3PO4 D.HF

2. Which of the following substances is alkaline----( )

A. Vinegar, hydrochloric acid B. Soda ash, salt

C. Hydrated lime, caustic soda D. Salt, vinegar

3. Use a simple method to distinguish between water and dilute sulfuric acid solution, and write down the experimental steps.

Use two test tubes to take a small amount of water and sulfuric acid solution respectively, and add 2 drops of purple litmus test solution respectively. If it turns red, it is a dilute sulfuric acid solution.

Keywords: Zhejiang Education Edition ninth grade science PPT courseware free download, acidity and alkalinity of substances PPT download, .PPT format;

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"Acidity and Alkalinity of Matter" PPT courseware:

"Acidity and Alkalinity of Matter" PPT courseware Part 1: Ionization of some substances 1. Ions: charged atoms or groups of atoms. Positively charged ones are called cations. Negatively charged ones are called anions. 2. Ionization: When some substances are dissolved in water or melted by heat, they produce...

"Acidity and Alkalinity of Matter" PPT (second lesson):

"Acidity and Alkalinity of Substances" PPT (Second Lesson) Part One Content: Learning Objectives: 1. Know the meaning of measuring the acidity and alkalinity of a solution; 2. Know the meaning of pH value and how to use pH test paper. ... ... ... PPT on the acidity and alkalinity of substances, part 2: complex...

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Update Time: 2024-11-13

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