"Acidity and Alkalinity of Matter" PPT (Second Lesson)

Description

"Acidity and Alkalinity of Matter" PPT (Second Lesson)

Part One Content: Learning Objectives:

1. Know the significance 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: review

1.Definition of acid

All the cations generated during ionization are hydrogen ion compounds

2. Common acids

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

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

5.Acid-base indicator

Purple litmus test solution; colorless phenolphthalein test solution

PPT on the acidity and alkalinity of substances, the third part: the degree of acidity and alkalinity of the solution

1. The significance of measuring the acidity and alkalinity of a solution

The acidity and alkalinity of the soil has a great influence on the growth of crops. Therefore, it is very necessary to determine the acidity and alkalinity of the soil.

The salinization of the land makes the soil more alkaline.

Alkaline soil will corrode crops and form lumps, making it difficult for vegetation to grow.

2. Determination of the acidity and alkalinity of a substance

(1) pH value

pH is an indicator that reflects the acidity and alkalinity of a substance.

The range is usually between 0 ~14.

A pH of 7 is neutral.

A pH less than 7 is acidic; a pH greater than 7 is alkaline.

The lower the pH, the stronger the acidity; the higher the pH, the stronger the alkalinity;

(2)Measurement method

The most common and simplest way to determine the acidity and alkalinity of a substance is to use pH test paper.

pH test paper will show different colors in solutions with different acidity and alkalinity.

How to use pH test paper:

1. Dip a clean glass rod into the solution being tested;

2. Drop on the pH test paper;

3. Compare the color displayed on the test paper with the standard color card;

4. See which color is closest to determine the pH of the solution.

PPT on the acidity and alkalinity of substances, part 4: summary

1. The acidity and alkalinity of the solution

1. The significance of measuring the acidity and alkalinity of a solution

To understand and control the acidity and alkalinity of a substance, we need to determine the acidity and alkalinity of a substance.

2. Determination of the acidity and alkalinity of a substance

(1) pH value

The range is usually between 0 ~14.

A pH of 7 is neutral.

A pH less than 7 is acidic; a pH greater than 7 is alkaline.

The lower the pH, the stronger the acidity; the higher the pH, the stronger the alkalinity;

(2)Measurement method

The most common and simplest way to determine the acidity and alkalinity of a substance is to use pH test paper________.

PPT on the acidity and alkalinity of substances, Part 5: Classroom exercises

1. The acidity and alkalinity of the soil directly affects the growth of crops. It is known that the soil in a certain area is weakly alkaline. Please refer to the suitable pH values ​​of the following crops: wheat: 5.5~6.5, rapeseed: 5.8~6.7, watermelon: 6.0~7.0, grass: 7.2~8.5. Considering the soil acidity and alkalinity, it is suitable for planting in this area. The crop is ( )

A. Watermelon B. Licorice C. Wheat D. Rapeseed

2. The correct operation for measuring the pH of a solution using pH test paper is ( )

A. Dip the test paper into the liquid to be tested

B. Pour the liquid to be tested onto the test paper

C. Dip the glass rod into the liquid to be tested and drop it on the test paper

D. Place the test paper above the liquid to be tested and let the liquid to be tested vapor fumigate the test paper

3. The experimentally measured pH of some body fluids in the human body is as follows, among which the most acidic one is----()

A. Saliva: 6.6～7.1 B. Gastric juice: 0.9～1.5

C. Sweat: 6.6～7.6 D. Plasma: 7.35～7.45

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

For more information about the "Acidity and Alkalinity of Matter" PPT courseware, please click on the "Acidity and Alkalinity of Matter" ppt tab.

"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 (first lesson):

"Acidity and Alkalinity of Matter" PPT Part One Content: Learning Objectives: 1. Know that substances are divided into acidic and alkaline. 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 acids and bases..

File Info

Update Time: 2024-10-01

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

Preview