Titration curve analysis lesson plan and reflection
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. 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