Assignment: This is an individual activity. After studying the lesson and watching all the videos, answer the following questions. Answer in not more than 3 sentences per question. 1. Discuss the a) direct method of weighing b) indirect weighing using the analytical balance. 2. Explain how suction filtration is carried out in the laboratory. Give the important points that must be observed in doing the process. 3. Explain why it is important to wash the precipitate. Can distilled water be used to wash all types of precipitates? 4. Discuss how to use a desiccator. When should a desiccant be replaced?

Assignment: This is an individual activity. After studying the lesson and watching all the videos, answer the following questions. Answer in not more than 3 sentences per question. 1. Discuss the a) direct method of weighing b) indirect weighing using the analytical balance. 2. Explain how suction filtration is carried out in the laboratory. Give the important points that must be observed in doing the process. 3. Explain why it is important to wash the precipitate. Can distilled water be used to wash all types of precipitates? 4. Discuss how to use a desiccator. When should a desiccant be replaced?

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter17: Complexation And Precipitation Reactions And Titrations

Section: Chapter Questions

Problem 17.16QAP

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Answer in not more than 5 sentences per question 1. Discuss the a) direct method of weighing b) indirect weighing using the analytical balance. 2. Explain how suction filtration is carried out in the laboratory. Give the important points that must be observed in doing the process. 3. Explain why it is important to wash the precipitate. Can distilled water be used to wash all types of precipitates? 4. Discuss how to use a desiccator. When should a desiccant be replaced? Give 2 examples of substances used as desiccants.
Multiple Choice Each of the numbered items or incomplete statements is followed by answers or by completions of the statement. Select the one lettered answer or completion that is best in each case. Write your answer before each number. 72. The experimental way of determining when equivalent amounts of reactants have reacted together is: a. Titration C. Standardization Equivalence point b. Stoichiometric point d. 73. Quality control department where new assay method is being develop for in-house use a. Material Inspection Section d. Quality Coordinating office b. Specification & Analyrtical Development e. Analytical Laboratory section C. Biological Testing Laboratory 74.Sulfuric acid is a a. Diprotic acid C. Tetraprotic acid Monoprotic acid b. Triprotic acid d.
To form large precipitates, what should be done? -Add the precipitating agent slowly with stirring. -Pour the precipitating agent immediately. -Decrease the temperature rapidly. -What can be done to form large precipitates? -Add a large excess of the precipitating agent.
2. In the deposition method, one of the conditions that must be met is…a. The precipitate has a high solubility or solubility productb. The precipitate formed must be quite difficult to dissolvec. The precipitate formed does not have to be quite pured. Free precipitate form 3. One of the conditions for selecting a sampling location…a. Near motorized vehiclesB. Near the incineratorC. Near the treeD. Far from buildings
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What would be a good way to extract milkfat from your casein precipitate? (think: solvent polarity)
In the case of over-titration, what should be done to the sample? Select one: a. Dilute the sample with water b. Discard and prepare another sample c. Add acid to revert the color back to faint pink or colorless d. Add more phenolphthalein indicator
1. What is the weight of the sample in trial 1? 2. What is the average weight of the precipitate in trial 1? 3. From the computed weight of the sample in trial 1, what is the theoretical amount of silver nitrate solution required to precipitate all of the chloride ions as silver chloride? 4. What is the molecular weight of the precipitate?
1. Select a product from the stock shelf and transfer the liquid to a test tube. 2. Select a paper pH test strip. Record the color of the test strip in the data chart. Transfer it to the same test tube. 3. Note any color change of the paper and record in the data chart. 4. Drag the test tube containing the test strip over to the color chart to determine the pH range indicated by the paper. Record your results. 5. Record your conclusion about whether the substance is an acid, a base, or a neutral substance. 6. Repeat for all substances.
What's In I. True or False. Write true if the statement is correct and false if it is incorrect. Use separate paper for your answers. 1. In sterilization process, alcohol solution should be 70%-90%. 2. It is very important to observe safety rules in sanitizing tools and equipment. 3. First thing to do in the preparation of metal implements is to soak the tools in cold soapy water. 4. Remove immediately tools and implements from disinfectant solution. 5. In storing tools and implements keep unclean and dull. 6. All hair, used cotton or other waste materials must be removed from the floor right away, and deposit it in a closed container. 7. Each beautician must wear a washable uniform while serving clients. 8. Only VIP's client must be provided with a freshly laundered towel. 9. Finger bowls must be sanitized before another client use them. 10. All waste materials should be disposed of in an enclosed waste bin fitted with polythene bin liner, durable enough to resist tearing.
Filter paper Saturated KNO; solution 259 Figure 1. Experimental apparatus. Experimental Procedure Part 1. Copper and Zinc Metal 1) Select a piece of copper and a piece of zinc metal wire from the containers in the hood. 2) Clean the surface of the metal wires with the steel wool. Wipe clean with a dry paper towel. 3) Obtain a plastic well plate. Fill one well with 10 drops of the Copper ion solution from the dropper bottle. Label this well with a Sharpie marker so that you remember which solution you filled it with, 4) Repeat step 3 with Zinc ion solution. Select a well right next to the well in step 3 so that the two wells with Copper and Zinc ion solution are right next to each other. 5) Obtain a small dry strip of filter paper. You may have to cut a large piece of filter paper down to the appropriate size. It should be exactly this big C It's OK to tear the filter paper with your hands. Using the drop bottle, saturate the filter paper strip with KNO; solution. Gently place one end…
If a solute is added to a saturated solution of that same material at the same temperature… A. All of the solute would sink to the bottom undissolved. B. All the Solute would dissolve. C. Some of the solute would dissolve. D. The solution would become colorless