"Neutralization Reaction of Acids and Bases" Acids and Bases PPT Courseware 4

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"Neutralization Reaction of Acids and Bases" Acids and Bases PPT Courseware 4

Ask the question: What reaction occurs between an acid and a base?

Experimental verification: dilute hydrochloric acid and sodium hydroxide solution are directly mixed

Observation phenomenon: no obvious phenomenon

Conclusion: No conclusion

Can you devise a feasible scheme to demonstrate that a reaction occurs between an acid and a base?

Chemical changes are often accompanied by color changes, gas release, precipitation, energy changes (exothermic, endothermic, luminous), etc.

[Experiment 10-9]Add 10 mL of sodium hydroxide solution into the beaker and add a few drops of phenolphthalein solution. Then slowly drop in dilute hydrochloric acid with a dropper, and stir the solution continuously until the color of the solution turns colorless.

Experimental phenomenon: the solution changes from red to colorless

Conclusion: Acids and bases react

Is this conclusion what we need?

Please give the students a try

1. Which of the following reactions is a neutralization reaction ( )

A. Zn + 2HCl = ZnCl2 +H2↑

B. CuO + 2HCl = CuCl2+ H2O

C. Ba(OH)2+ H2SO4 = BaSO4 ↓+ 2H2O

D. AgNO3+HCl = AgCl↓ +HNO3

2. For each of the following groups of substances, indicators can usually be used to prove whether they react ()

A. Copper hydroxide and dilute hydrochloric acid

B. Limestone and dilute hydrochloric acid

C. Reaction of calcium hydroxide and sodium carbonate

D. Caustic soda and dilute sulfuric acid

2. Application of neutralization reaction in practice

1. Change the acidity and alkalinity of the soil

Plants need to grow in soil with a certain acidity and alkalinity. However, in recent years, due to the unreasonable use of chemical fertilizers or the formation of acid rain, the acidity and alkalinity of the soil have been destroyed, which is not conducive to the growth of plants. How should we change the acidic soil?

2. Treatment of wastewater from factories

The wastewater discharged from a sulfuric acid plant contains sulfuric acid and other impurities, which seriously harms the local ecological environment. How will you deal with this wastewater?

Neutralize with an alkaline substance such as hydrated lime.

Can you write a chemical equation? Please try it

Ca(OH)2 + H2 SO4 == CaSO4 + 2H2O

1. In some areas of southern my country, there are acidic soils that are not suitable for the growth of certain crops. In order to improve crop growth conditions, the substances commonly used by local farmers to neutralize soil acidity are ( )

A. Limestone B. Hydrated lime C. Caustic soda D. Acetic acid

2. In a chemistry experiment class, the teacher asked the students to explore the following experiment.

Explore which particle in the sodium hydroxide solution can make the colorless phenolphthalein solution change color

[Experiment] (1) Add about 2mL of distilled water to the first test tube, and add a few drops of colorless phenolphthalein solution. Phenomenon: The solution does not change color.

(2) Add about 2 mL of sodium chloride solution to the second test tube and add a few drops of colorless phenolphthalein solution. Phenomenon:_________.

(3) Add about 2 mL of sodium hydroxide solution to the third test tube, and add a few drops of colorless phenolphthalein solution. Phenomenon:_________.

in conclusion_________.

Survey and Research

1. Simple method for measuring soil acidity and alkalinity: sampling, dissolving, and measuring.

Student exercises: 1. Students from a chemistry extracurricular activity group in a school took rainwater samples that had just fallen to the ground and used a pH meter (an instrument for measuring pH) to measure the pH every few minutes. The data are as shown in the table below:

⑴Is the rainfall being acid rain? During the measured time, does the acidity of rainwater increase or decrease?

The pH value is less than 5.6, so it is acid rain.

The pH is decreasing, so it becomes more acidic.

⑵ After investigation, there is a sulfuric acid plant (SO2 is generated during the production process) and an electroplating plant in this area. The fuel used in these plants is mainly coal. In addition, the domestic fuels in this area are mainly coal and liquefied petroleum gas. Try to analyze the main causes of acid rain in this area. What measures do you think should be taken?

The waste gas from the sulfuric acid plant must be treated to meet standards before being discharged.

Reduce the use of fossil fuels (such as coal) and use clean energy.

2. "Soil testing and seed selection" is a commonly used scientific method in modern agricultural production. The solution leached from the soil in a village in the Wudang Mountain Special Zone is added to the colorless phenolphthalein solution, which turns red. The following table shows the PH range suitable for the growth of four crops. Which crops do you think the soil in the village is more suitable for growing? ( )

A.Corn B.Tea C.Rice D.Potato

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For more information about the PPT courseware "Acid and Base Neutralization Reaction of Acids and Bases", please click on the Acids and Base ppt Neutralization Reaction of Acids and Bases ppt tag.

"Neutralization Reaction of Acids and Bases" Acids and Bases PPT Courseware 3:

"Neutralization Reaction of Acids and Bases" Acids and Bases PPT Courseware 3 Learning Objectives 1. Through experiments, confirm the neutralization reaction between acids and bases, and further understand the principle of neutralization reactions from a microscopic perspective; 2. Understand Effects of acids and alkalis on life activities and crops; 3..

"Neutralization Reaction of Acids and Bases" Acids and Bases PPT Courseware 2:

"Neutralization Reaction of Acids and Bases" Acids and Bases PPT Courseware 2 Learning Objectives 1. Master the neutralization reaction that occurs between acids and bases 2. Be able to design experiments to prove that reactions can occur between common acids and bases; 3. Understand the application of neutralization reactions and the concept of salt. Explore sodium hydroxide..

"Neutralization Reaction of Acids and Bases" Acids and Bases PPT Courseware:

"Neutralization Reaction of Acids and Bases" Acids and Bases PPT Courseware Learning Objectives 1. Know that what occurs between acids and bases is a neutralization reaction 2. Understand the application of neutralization reactions in practice 3. Understand the effects of acid and alkali on life activities and the impact on crops 4. Can use pH test paper to qualitatively measure the solution.

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Update Time: 2024-07-23

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

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