"Chemical Properties of Acids, Bases and Salts" PPT courseware

Description

"Chemical Properties of Acids, Bases and Salts" PPT courseware

【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 and put it 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.

③Write the chemical equation related to the reaction

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 precipitate dissolves and disappears, and the solution turns blue

③Write the chemical equation related to the reaction

4. Pour a small amount of dilute solution of sodium hydroxide into a beaker, drop a few drops of phenolphthalein solution, and observe the phenomenon. Then slowly drip in dilute hydrochloric acid with a dropper while shaking the beaker continuously until the color of the solution turns colorless. Take a drop of solution in an evaporating dish

Place it on the flame of an alcohol lamp to bake and observe the phenomenon.

①The solution is red;

②A white solid appears in the evaporating dish.

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 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.

Write the chemical equation:

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File Info

Update Time: 2024-09-08

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

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