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The following is an example of a lesson plan on the analysis of an acid and base titrations curve: ** 1. Teaching objectives ** 1. Let the students understand the concept of the acid base titrations curve and its drawing principle. 2. To help students master how to obtain information from the acid and base titrations, such as the end point of the titrations, the change in the ph of the solution, etc. 3. Cultivate the students 'ability to solve practical chemical problems with the use of acid and base titrations, such as selecting suitable indicators. ** 2. Important and Difficult Points in Teaching ** 1. ** Main point ** - The drawing method and principle of the acid and base titrations curve. - According to the titrations curve, the end point of the titrations was determined and the appropriate indicator was selected. 2. ** Difficulty ** - Understand the significance of sudden changes in the pH of the titrations and its influencing factors. - The relevant chemical calculations, such as the concentration of acid or base, were carried out using the Titration curve. ** 3. Teaching Method ** Teaching method, discussion method, demonstration method. ** 4. Teaching process ** #(I) Introduction 1. He reviewed the concept of the alkali-base neutralizing reaction and asked,"How to accurately measure the extent of the alkali-base neutralizing reaction?" Guide the students to think about and introduce the concept of acid base titrations. 2. Show a simple diagram of an experiment device for acid and base titrations, and briefly introduce the instruments needed for the experiment, such as acid buret, basic buret, conical flask, etc. #(II) New lesson teaching 1. ** Drawing Principle of Acid Base Titration curve ** - Explain that the curve of the acid and base titrations was a curve drawn with the amount of acid (or base) added in the acid and base neutralizing titrations as the abyssal coordinate and the solution's pH. It was a curve that changed with the amount of acid (or base) added. - Using the example of titrating a solution of unknown concentration with a solution of known concentration of sulfuric acid, he explained in detail the changes in the pH value during the experiment. At the beginning of the titrations, the base in the solution was excessive, and the pH value was high. As the acid was added, the pH value gradually decreased. When the titrations were close to the end point, the pH value would suddenly change. After the titrations were over, the acid in the solution was excessive, and the pH value further decreased. 2. ** Experimental operation demonstration (video demonstration available)** - Weigh out the solution of the sodium-ether to be tested in a conical flask, and drop a few drops of the phenolothalin indicator into it. - An acid buret filled with a known concentration of sulfuric acid was fixed on the titrator, and the liquid level was adjusted to near the zero scale line. - Slowly drip the sulfuric acid into the conical flask while shaking it. At the same time, observe the color change of the solution and record the volume of the sulfuric acid added and the corresponding pH value (it can be measured with a pH meter). - When the color of the solution changed from red to colorless and did not return to its original color within half a minute, it was the end point of the titrations. Record the volume of the consumed sulfuric acid at this time. 3. ** Titration curve analysis ** - Show a typical image of an acid and base titrations curve to guide students to observe the shape of the curve, especially the area of sudden change in pH-value near the end of the titrations. - Explain how to determine the end point of the titrations according to the titrations curve: Find the corresponding volume of acid (or base) in the abrupt change region of the curve. This volume is the volume of titrant consumed when reaching the end point of the titrations. - It was analyzed how to select the appropriate indicator according to the titrations curve: the indicator's color change range should be consistent with the range of the sudden change of the pH near the end point of the titrations as much as possible. For example, the color change range of methylethalin was 8.2 - 10.0, which was suitable for the case of strong base titrating strong acid or strong base titrating weak acid; the color change range of methylethalin was 3.1 - 4.4, which was suitable for strong acid titrating strong base or strong acid titrating weak base. - Explain how to use the Titration curve to perform relevant chemical calculations, such as calculating the concentration of the solution to be tested based on the volume of titrant consumed at the end of the Titration and the known concentration of titrant. #(3) Class Discussion 1. Give some different types of acid and base titrations (such as strong acid titrating weak base, weak acid titrating strong base, etc.) and let the students discuss the characteristics of the corresponding titrations curve, such as the final point of the titrations, the range of the sudden change of the pH. 2. Each group would send representatives to speak and share the results of the discussion. The teachers would comment and summarize to deepen the students 'understanding of different types of acid and base titrations. #(IV) Class Practice 1. Give some pictures of the acid and base titrations and ask the students to answer the following questions: - The volume of titrant corresponding to the end point of the titrations was determined. - Judge which indicator may be used in the Titration process. - The concentration of the solution to be tested was calculated according to the data in the image. 2. The teacher inspected the students 'practice and gave them timely guidance and questions. #(5) Class summary 1. This paper reviews the drawing principle of acid and base titrations curve, the key points of experiment operation, the analysis method of titrations curve, and the relevant chemical calculations. 2. It emphasized the importance of acid and base titrations in chemical analysis, such as accurately determining the concentration of acid or base and studying the nature of acid and base reactions. #(6) Assignment 1. Students were asked to design an experimental plan for the titrating of weak acid with a strong base, including the purpose of the experiment, the principle of the experiment, the experimental equipment and drugs, the experimental steps, and the expected shape of the titrating curve. 2. Search for information to understand what other types of titrations curves are other than the acid and base titrations curve, and briefly introduce their characteristics. ** Reflection on lesson plan: ** 1. ** Strengths ** - Through the combination of experimental demonstration and image analysis, students could more intuitively understand the concept and analysis method of the acid and base titrations curve. - The classroom discussion session could stimulate students 'thinking and improve their independent learning ability and teamwork ability. - The classroom exercises and assignments helped to consolidate the knowledge that the students had learned and cultivate their innovative thinking and knowledge development ability. 2. ** Not enough ** - For some students with weak foundations, it might be difficult to understand the chemical calculation part of the Titration curve. In the future, some special exercises on basic calculation could be added to the teaching. - In the experimental demonstration segment, if the students could increase their practical operation opportunities, the teaching effect might be better. However, due to the limitations of experimental equipment and classroom time, it could not be achieved. This was something that needed to be improved. - He might not have gone deep enough in explaining the influencing factors of the Titration curve. For example, the influence of temperature on the Titration curve could be further improved in the subsequent teaching. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

While waiting for the TV series, he could also read the exciting content related to this site!

The Vast Cold Palace was located in the Heavens above. The fairy Chang'e lived here. It was a place full of dreams and mysteries. On the stage, the upcoming dance of Guanghan Palace seemed to bring us into that mythical world. The dancers were like fairies who had descended to the mortal world. They were dressed in gorgeous immortal clothes and their dance steps were light and agile. They will use the dance to show the coldness and mystery of the Guanghan Palace, as well as the grace of Chang'e Fairy. Let us immerse ourselves in this wonderful dance and feel the unique charm of the Guanghan Palace. The original novel of the TV series " The Unique Empress of Generals " was called " The Rebirth of the Poisonous Empress of Generals." The original plot was equally exciting. You can click on the link below to read the original novel.

From the reference materials, it was only mentioned that " The Confusion of the Koto-no-Kyu-no-I-I-no-I-I <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

I'm not sure which work you're referring to. If you're referring to the 'Xiaoai' in Crayon Shin-chan, Masao's second appearance will be in Season 2, episode 491, where he becomes a captive of love. If it was referring to Little Ai in the online drama Detective in Chinatown 2, she had appeared in the second case. For example, she pretended to be Lin Mo's niece and sent Lin Mo to a mental hospital (refer to the related plot of the online drama Detective in Chinatown 2). The original work was equally exciting. You could click on the original work of "The Story of Rose" to understand the plot in advance!

Generally speaking, red dates bought online could be eaten directly. They were usually not poisonous. Red dates were the ripe fruits of jujube, a species of jujube in the Rhamnacea family. From the perspective of traditional Chinese medicine, red dates had the effects of strengthening the body, replenishing blood and nourishing yang, etc. From the perspective of modern nutrition, red dates contained a variety of nutrients such as biochemistry, crude fiber, calcium, phosphorus, potassium, calcium, and so on. Normal consumption could supplement the nutrients needed by the human body. However, for some people, such as the elderly, children, and patients with stomach diseases with poor digestion and absorption, the indissolvable nutritional fiber in the red jujube skin may increase the burden on the stomach, and even cause adverse reactions such as indigestion and diarrhea; People with damaged esophagus may also be harmed by the stimulation of the red jujube skin; Overconsumption of red dates, whether eaten raw or cooked, may cause a certain burden on the digestive tract, such as abdominal distension, flatulence, etc. Therefore, although red dates bought online could usually be eaten directly and were non-toxic, they should be eaten in appropriate amounts according to one's physical condition. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

There are many ways to get the original English version of Harry Potter. For example, you can follow the public account of "New Wenda International Education" and reply to "Harry Potter" in the public account to get 1 - 7 full sets of English e-books. The Shanghai Library once announced that the English e-book audio book of "Harry Potter and the Philosopher's Stone" was free for one month. You can also check if there are similar free borrowing opportunities. In addition, some netizens will share the English e-book resources in the comment section. Harry Potter and the Chamber of Secrets is not enough. Everyone is welcome to click to read the novel!

In Léon: The Killer, the staircase scene was cleverly used in many places. In the scene where the female lead appeared, the first thing to do was to use the perspective of a staircase to explain the environment. The overlapping stairs used geometric composition to create a sense of confinement and seriousness. Then, he zoomed in. The female lead's feet entered the painting first, forming a sharp contrast. It triggered suspense and aroused the audience's expectations. It created a cute image for the female lead, and through the contrast of the environment, it hinted that the female lead was not free and was restricted in her life. There was also a section of the stairs that was distorted. When the fat man's accomplices were looking for Leon, the twisted stairs gave people a feeling of nervousness and terror. At this time, Leon's hand reached out from below and killed the fat man's accomplices. Watching Léon: The Assassin wasn't satisfying enough. Everyone is welcome to click to read the novel!

Coach: coach or instructor;"Send him away": send off or see off; A group of students: A batch of trainees or a group of trainees; Need: need or require; Rest: rest or take a break; Several days: several days or a few days. Does the coach need to rest for several days after sending off a batch of trains? <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>