| Category | Format | Size |
|---|---|---|
| Cantonese Education Edition Ninth Grade Chemistry Volume 2 | pptx | 6 MB |
"Acidity and Alkalinity of Solutions" Common Acids, Alkalis, and Salts PPT Courseware
Description
"Acidity and Alkalinity of Solutions" Common Acids, Alkalis, and Salts PPT Courseware
learning target
1. Learn to use litmus and phenolphthalein indicators to test the acidity and alkalinity of solutions.
2. Understand the relationship between the acidity and alkalinity of a solution and the pH of the solution, and be able to use pH test paper to quantitatively measure the pH of the solution.
3. Understand the pH of common substances and the impact of pH on life and crop growth.
Distinguish between acidic and alkaline solutions
[Recall] How does the color change when CO2 is passed into purple litmus solution?
Substances that can react with acidic solutions or alkaline solutions to show different colors are called acid-base indicators, or indicators for short.
Litmus and phenolphthalein are common indicators.
Check the acidity and alkalinity of the solution
pH: The acidity or alkalinity of a dilute solution.
Range: 0~14
Condition: normal temperature
summary
If the concentration of a solution of the same substance changes, the pH will also change.
That is, if the acid becomes dilute, the pH will rise and the acidity will weaken, but it will not exceed 7.
If the base becomes dilute, the pH will drop and the alkalinity will weaken, but it will not be less than 7.
pH and life activities
Gastric acid can help digestion, but if there is too much gastric acid, it will damage the stomach and duodenum, and even burn the mucosa and muscles, causing gastric ulcers or duodenal ulcers and other diseases.
If the blood pH is too high or too low, it will affect the activity of various enzymes, thereby affecting the normal metabolism of the organism.
Small scale chopper
Read textbook P224 to extract acid-base indicators from flowers.
1. Xiao Wang measured the pH of some substances in life as shown in the table below. Which of the following statements is incorrect ( )
A.Sucrose water is a neutral substance B.Soapy water is weaker than soda ash water
C. Lemon juice is more acidic than vinegar D. Rainwater can turn purple litmus paper red
2. The figure below shows the approximate pH of some substances around us at room temperature. The correct comparison and judgment about these substances is ( )
A. Plant ash water is acidic
B. Egg white is more alkaline than plant ash water
C.Orange juice is acidic
D. Lemon juice can make
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For more information about the PPT courseware "Acidity and Alkalinity of Common Acid, Alkali and Salt Solutions", please click on the acidity and alkalinity of common acid, alkali and salt ppt solutions ppt tag.
"Acidity and Alkalinity of Solutions" Common Acids, Alkalis, and Salts PPT Courseware 4:
"Acidity and Alkalinity of Solutions" Common Acids, Alkalis, and Salts PPT Courseware 4 Knowledge Review Knowledge Point 1 Distinguish between acidic solutions and alkaline solutions To determine the acidity and alkalinity of a solution, you can use _____________. Like litmus and phenolphthalein, they can react with acid or alkali solutions.
"Acidity and Alkalinity of Solutions" Common Acids, Alkalis, and Salts PPT Courseware 3:
"Acidity and Alkalinity of Solutions" Common Acids, Alkalis, and Salts PPT Courseware 3 Learning Objectives 1. Learn to distinguish acidic solutions from alkaline solutions 2. Be able to use acid-base indicators to qualitatively test the acidity and alkalinity of solutions 3. Be able to use pH Test paper quantitatively measures the pH of a solution 4. Know the common...
"Acidity and Alkalinity of Solutions" Common Acids, Alkalis, and Salts PPT Courseware 2:
"Acidity and Alkalinity of Solutions" Common Acids, Alkalis, and Salts PPT Courseware 2 New Knowledge Preview 1. Distinguish between acidic solutions and alkaline solutions 1. Acid-base indicator: A substance that can react with ______ solution or ______ solution to show _____________ is called an acid-base indicator, or...
File Info
Update Time: 2024-06-01
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