| Category | Format | Size |
|---|---|---|
| People's Education Press Ninth Grade Chemistry Volume 2 | pptx | 6 MB |
"Chemical Properties of Acids and Bases" Acids and Bases PPT Courseware 3
Description
"Chemical Properties of Acids and Bases" Acids and Bases PPT Courseware 3
Experimental activity 6 Chemical properties of acids and bases
【Purpose】
1. Deepen your understanding of the main properties of acids and bases
2. Explain some phenomena in life through experiments
【Experimental Supplies】
Test tubes, medicine spoons, evaporating dishes, glass rods.
Dilute hydrochloric acid, dilute sulfuric acid, dilute sodium hydroxide solution,
Calcium hydroxide solution, copper sulfate solution, calcium hydroxide powder litmus solution, phenolphthalein solution, pH test paper, rusty iron nails
【Experimental steps】
1. Refer to the figure below to conduct an experiment and compare the effects of acids, bases and indicators.
2. Take a rusty iron nail, put it head down into a test tube, then add dilute hydrochloric acid so that the rusty iron nail is partially immersed in the dilute hydrochloric acid, and observe the phenomenon. When the surface of the iron nail becomes shiny, what phenomenon begins to appear on the surface of the iron nail?
①The rust on the surface of the nail gradually disappears and becomes bright, and the solution turns yellow;
②When the iron nail becomes bright, bubbles can be observed on the surface of the iron nail.
3. Add about 2 mL of copper sulfate solution to the test tube, then add a few drops of sodium hydroxide solution and observe the phenomenon. Then add dilute hydrochloric acid to the test tube and observe the phenomenon.
① A blue flocculent precipitate appears and the solution becomes colorless
②The blue flocculent precipitate dissolves and the solution turns blue-green
5. Take a small spoonful of calcium hydroxide and put it into a beaker, then pour water into the beaker containing calcium hydroxide, stir it with a glass rod, and observe the phenomenon. Place limewater into two test tubes, drop purple litmus solution and colorless phenolphthalein solution respectively, and observe the phenomenon. Add an appropriate amount of calcium hydroxide powder (use the handle of a medicine spoon to pick up a little at one end) into a clean test tube, then use a rubber dropper to absorb dilute hydrochloric acid, add it into the test tube, shake, and observe the phenomenon.
① Calcium hydroxide is not easily soluble in water, that is, it is slightly soluble in water.
②Purple litmus solution shows blue, and colorless phenolphthalein solution shows red.
③Calcium hydroxide powder gradually dissolves to form a colorless solution.
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For more information about the PPT courseware "Chemical Properties of Acids and Bases and Acids and Bases", please click on the Chemical Properties of Acids and Bases ppt ppt tag.
"Chemical Properties of Acids and Bases" Acids and Bases PPT Courseware 2:
"Chemical Properties of Acids and Bases" Acids and Bases PPT Courseware 2 Collaborative Exploration 1 Experimental steps: 1. Take a drip plate, add 2~3 drops of the above four solutions to the four holes, and then add 2~3 drops respectively. Drop purple litmus 2. Take an intravenous drip board and add 2~3 drops to four of the holes.
"Chemical Properties of Acids and Bases" Acids and Bases PPT Courseware:
"Chemical Properties of Acids and Bases" Acids and Bases PPT Courseware Exchange Answers 1. Phenomenon: Litmus solution turns red when it meets sulfuric acid solution and hydrochloric acid solution; litmus turns blue when it meets sodium hydroxide solution and calcium hydroxide solution; phenolphthalein solution turns blue when it meets hydrogen Sodium oxide solution and calcium hydroxide solution turn red; ..
File Info
Update Time: 2024-07-23
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