What is the meaning of calcium back-titration?The calcium reactor was the short name for the calcium reactor. Its principle was to dissolve solid calcium carbonate-based media through weakly acidic seawater to form seawater rich in calcium and alkaliity-based seawater that was fed into the fish tank to increase the level of calcium and alkaliity-based seawater. It required equipment such as carbon dioxide tanks and squirming pump. Titration was a method that could add other trace elements in addition to the analytical reagents of calcium, calcium, and KH. Back-Titration of calcium may refer to the use of the method of titration in the process of calcium reversal, or in situations involving calcium reversal (such as replenishing certain substances or elements in calcium reversal), the principle or operation of titration may be used to supplement or regulate the elements such as calcium in the aquarium.
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Titration curve analysis lesson plan and reflectionThe 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.
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Why are there funny cartoons about milk precipitation?I think funny cartoons about milk precipitation exist because it's a unique and offbeat concept that catches people's attention. Cartoonists like to take such unusual things and turn them into something humorous and engaging for the audience.
How to lower the blood precipitation-responsive proteinThe term "blood precipitation-reaction protein" was not accurate. It might refer to blood precipitation-reaction protein (CPR) and C-reaction protein (CPR).
For blood transfusion rate:
1. ** High blood transfusion rate due to physiological reasons **
- If it was a woman's menstrual period, more than three months of pregnancy, or a person over the age of 60 who had a high blood transfusion rate, it generally did not require special treatment.
2. ** Pathological causes cause of high blood transfusion rate **
- ** Anemia-correcting **: Anemia-patients can take oral iron agents (such as iron dextrane, iron glyconate, etc.) to correct the anemia-correcting agent, thereby reducing the blood transfusion rate.
- ** Control infection **: After inflammation patients use antibiotics to control their inflammation, their blood stasis rate can gradually return to normal.
- ** Anti-tumor treatment **: Patients with leukemia take anti-tumor drugs such as isoniazid, rifampicin, and pyrazinamid. After the condition stabilizes, the blood transfusion rate can gradually return to normal.
- ** Radiotherapy-therapy **: Patients with malignant tumors can use radiation to kill cancer cells, shrink the tumor, or take drugs such as taxol and cisplatin-based chemotherapy to reduce the blood transfusion rate.
- ** Other methods **: For example, patients with hypergammaglobulinuria caused by liver cancer and other reasons can be treated with liver protection to reduce their blood transfusion rate.
For C-reaction protein:
1. ** Against infection **
- If it's a bacteria infection, when CPR>50 milligrams per liter, it's recommended to use antibiotics to control the infection and lower C-reaction protein. However, for viral infection, most of the CPR levels were normal or slightly elevated, mainly for the treatment of the virus itself (such as anti-viral drugs or relying on their own immunity to recover).
2. ** For immune diseases (such as rheumatism)**
- ** Anti-inflammatory painkillers **: For patients with severe joint swelling and pain, especially when slow-acting anti-rheumatism drugs are not effective, non-steroid anti-inflammatory drugs or steroids can be used under the guidance of a doctor to relieve inflammation and reduce C-reaction protein. However, after the inflammation is relieved and the swelling and pain are eliminated, anti-inflammatory painkillers should be stopped immediately.
- ** Anti-rheumatism drugs **: These include traditional synthetic anti-rheumatism drugs (dsDIMARDs), biologics (bDIMARDs), targeted synthetic anti-rheumatism drugs (tsDIMARDs), etc. Some Chinese medicine and Chinese patent medicines can also be used as an auxiliary treatment. They follow the principle of combination medication and individual treatment to reduce disease activity and thus reduce C-reaction protein.
3. ** For tissue damage (such as tissue necroses caused by severe trauma, major surgery, burns, and cardiac arrest)**
- It was mainly for the treatment of the primary disease, such as reperfusing therapy for patients with acute myocardiac arrest. As the tissue damage was repaired, the C-reaction protein would gradually decrease.
4. ** For other diseases (such as malignant tumors, chronic kidney disease, acute rejection of organ transplantation, etc.)**
- With the corresponding treatment for specific diseases, such as chemotherapy and chemotherapy for patients with malignant tumors, C-reaction protein could be reduced as the disease was controlled.
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