"Acidic Solutions and Alkaline Solutions" Initial Acids, Bases and Salts PPT Courseware 3

Description

"Acidic Solutions and Alkaline Solutions" Initial Acids, Bases and Salts PPT Courseware 3

teaching objectives:

1. Understand common acid-base indicators and be able to use acid-base indicators to distinguish acidic solutions and alkaline solutions.

2. Understand the relationship between the acidity and alkalinity of the solution and the pH value of the solution

3. Understand the importance of the acidity and alkalinity of solutions to industrial and agricultural production and human life

life inspiration

The wine tastes spicy - there is ethanol in the wine

Sugar water has sweetness - there is sucrose in sugar water

Salt water has a salty taste - Salt water has sodium chloride

Soda water has a bitter taste - it contains alkaline substances

Vinegar and yogurt have a sour taste - they contain acidic substances

Summarize:

1. What can make purple litmus red is an acidic solution. Or acidic solution can make purple litmus red.

2. What can turn purple litmus blue is an alkaline solution, or an alkaline solution can turn purple litmus blue.

3. What can make colorless phenolphthalein turn red is an alkaline solution or an alkaline solution can make colorless phenolphthalein turn red.

Classification of solution acidity and alkalinity:

Acidic solution: such as white vinegar, dilute hydrochloric acid, ammonium chloride solution, dilute sulfuric acid, carbonic acid, etc.;

Neutral solution: such as salt water, sucrose water, distilled water, etc.;

Alkaline solution: such as sodium hydroxide solution, sodium carbonate solution, lime water (calcium hydroxide solution), etc.

pH of a solution – pH of a solution

1. pH range: 0-14

2. The relationship between pH and solution acidity and alkalinity:

1. pH=7, the solution is neutral

2. When pH<7, the solution is acidic, and the smaller the pH, the stronger the acidity.

3. When pH>7, the solution is alkaline, and the greater the pH, the stronger the alkalinity.

3. Use pH test paper to roughly measure the pH of the solution

1. Take a piece of pH test paper and place it in a watch glass;

2. Dip a clean glass rod into the liquid to be tested and drop it onto the test paper;

3. Match the color displayed on the test paper with the standard color card to determine the pH value of the solution.

The importance of acidity and alkalinity of solutions in production and life

1. Different plants have different pH environments suitable for growth. By adjusting the pH of the soil solution, plants can grow better;

2. The pH of body fluids in different parts of the human body is also different;

3. Measure the pH of rainwater to monitor the occurrence of acid rain. The pH of normal rainwater is less than 7. Because of the dissolved carbon dioxide, the pH of acid rain is less than 5.6.

pH and human health

The pH value of human body fluids is normal when it is 7.35~7.45;

When the pH value of human body fluids is <7.35, it is in a sub-healthy state;

When the pH value of human body fluids = 6.9, it becomes a vegetative state;

Death occurs when the pH value of human body fluids is 6.85~6.45.

Improvement exercises:

1. The following pH value indicates the most acidic solution:

A, pH=0 B, pH =1

C, pH =7 D, pH =14

2. Doctors remind patients with hyperacidity to eat less apples. Then the pH of apples:

A, greater than 7 B, less than 7

C. Equal to 7 D. Unable to judge

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For more information about the PPT courseware "Initial Acids, Bases and Hydrochloric Acid Solutions and Alkaline Solutions", please click on the Initial Acids, Bases and Salts ppt Acidic Solutions and Alkaline Solutions ppt tag.

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Update Time: 2024-11-15

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

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