"Chemical Properties of Acids and Bases" Acids and Bases PPT Courseware 2

Description

"Chemical Properties of Acids and Bases" Acids and Bases PPT Courseware 2

Collaborative exploration 1

Experimental steps:

1. Take an intravenous drip plate, add 2 to 3 drops of the above four solutions to each of the four holes, and then add 2 to 3 drops of purple litmus to each of the four holes.

2. Take the drip plate, add 2 to 3 drops of the above four solutions to each of the four holes, and then add 2 to 3 drops of colorless phenolphthalein respectively.

Experimental phenomena:

Experimental results:

Acidic solutions can turn purple litmus solution red, but cannot turn colorless phenolphthalein solution. Alkaline solutions can turn purple litmus blue and colorless phenolphthalein red.

Collaborative exploration 2

Reaction of rust, iron nails and dilute hydrochloric acid

Experimental steps:

1. Take two rusty iron nails and put them into two test tubes respectively, then add about 2mL of dilute hydrochloric acid and observe the phenomenon. When it is observed that the rust on the surface of the iron nail is removed and the iron nail becomes shiny, take out the iron nail in one of the test tubes and wash it.

2. Continue to observe the phenomenon in the other test tube. After a while, take out the iron nails and wash them. Comparing two iron nails

Experimental phenomena:

Experimental results:

Dilute hydrochloric acid can react chemically with iron and rust. When using dilute hydrochloric acid to remove rust on metal surfaces, be careful to control the amount of acid used.

Groups 1, 2, 3 and 4 do the reaction between copper sulfate and sodium hydroxide

1. Add about 2mL of copper sulfate solution into the test tube, then add a few drops of sodium hydroxide solution and observe the phenomenon.

2. Add dilute hydrochloric acid to the above solution test tube and observe the phenomenon.

Do the fifth and sixth groups

Reaction of sodium hydroxide and hydrochloric acid

1. Add about 1mL sodium hydroxide solution to the test tube, and then add a few drops of phenolphthalein

2. Slowly drip dilute hydrochloric acid into the above test tube with a dropper, and continuously shake the test tube until the color of the solution turns colorless.

3. Take about 1mL of the above colorless solution and place it in an evaporating dish and heat it to evaporate the liquid to dryness and observe the phenomenon.

Do the seventh and eighth groups

Reaction of calcium hydroxide and dilute hydrochloric acid

1. Add the same amount of calcium hydroxide powder to each of the two test tubes, then add 1mL of water and shake

2. Add 1 to 2 drops of phenolphthalein to each of the two test tubes above and observe the phenomenon.

3. Continue to add about 1mL of water to one of the test tubes and shake

4. Add about 1mlL dilute hydrochloric acid to another test tube, shake,

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"Chemical Properties of Acids and Bases" Acids and Bases PPT Courseware 3:

"Chemical Properties of Acids and Bases" Acids and Bases PPT Courseware 3 Experimental Activity 6 Chemical Properties of Acids and Bases [Purpose of Experiment] 1. Deepen the 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,...

"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; ..

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Update Time: 2024-09-10

This template belongs to Chemistry courseware People's Education Press Ninth Grade Chemistry Volume 2 industry PPT template

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