Answered: 1. What type of precipitate is BaSO4?…

1. What type of precipitate is BaSO4? 2. Why is a filter paper preferred over a sintered glass filter? 3. What made an ashless filter paper ashless?

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter13: The Chemistry Of Solutes And Solutions

Section: Chapter Questions

Problem 83QRT

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1. What type of precipitate is BaSO4?
2. Why is a filter paper preferred over a sintered glass filter?
3. What made an ashless filter paper ashless?

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GUIDE QUESTIONS 1. What type of precipitate is BasO4? 2. Why is a filter paper preferred over a sintered glass filter? 3. What made an ashless filter paper ashless? 4. What does the number in a filter paper's brand represent? 5. Why is a porcelain crucible used in this procedure? 6. Why do we need to precipitate from a hot solution? 7. Why is the precipitating agent added all at once? 8. What is the purpose of adding 6M HCI in the sample solution? 9. Why do we need to test the washings with AgN0:? 10. What is done in an ignition process? 11. What is the product after the precipitate was ignited? 12. What are the advantages of performing ignition? 13. Cite the sources of errors for this experiment and explain how to possibly circumvent these kinds of problems.
8. The process by which a diverse ion gets trapped by a growing precipitate particle but does not become part of the crystal lattice A. occlusion В. adsorption C. post-precipitation D. inclusion
Why does the glasswares need to be rinsed with 0.1 M HNO3 prior to use?
Why is recrystallization not applicable to samples which contain large amount of impurities?
Distinguish absorption from adsorption. When you heat glassware in a drying oven, are you removing absorbed or adsorbed water?
Guide Questions[1] What type of precipitate is BaSO4?[2] Why is filter paper preferred over a sintered glass filter?[3] What made an ashless filter paper ashless?[4] Why is a porcelain crucible used in this procedure?[5] Why do we need to precipitate from a hot solution?[6] Why is the precipitating agent added all at once?[7] What is the purpose of adding 6M HCl in the sample solution?[8] Why do we need to test the washings with AgNO3?[9] What is ignition?[10] What is the product after the precipitate was ignited?[11] What are the advantages of performing ignition?[12] Cite the sources of errors for this experiment and how to circumvent these problems.
1. A sample of freshly precipitated silver chloride weighs 704.7 mg. Before the solution can be filtered and washed, 10.0 mg of AgCl is photodecomposed. After the precipitate is filtered and washed, another 10.0 mg of AgCl is photodecomposed. Calculate the weight of the precipitate.
Which among the following solvents would PbBr2 (Ksp = 4.0 x 10-5) be least soluble in? a. 0.1 M Pb(NO3)2 (aq) b. pure water c. 0.1 M KCl d. 0.1 M KBr(aq)
3. It is used to convert the known weight of the precipitate to the corresponding weight of the analyte. a. Gravimetric factor b. Mole ratio c. Mass ratio d. All of the choices 4. Which of the following is used to express the ppm of the solution? a. Kg analyte/liter solution b. Mg analyte/liter solution x 10^6 G analyte/ g sample x 10^6 d. Kg analyte/kg sample C.
2. The standard Winkler method uses sodium iodide and sodium azide to be added at the same time as sodium hydroxide. What is the purpose of sodium azide? 3. Chlorinated tap water contains both chlorine (Cl2) and hypochlorite (OCl-) does the presence of these species affect DO results? Write equations to represent their individual interactions.
What is the expected visual observation when ether and hot, acidic potassium permanganate were mixed in a test tube? a. Formation of brown precipitate and disappearance of purple colorb. The purple color of potassium permanganate remains its purple color.c. Evolution of gas, formation of brown precipitate and disappearance of purple color
17. This type of analysis implies that the constituent determined was present in very, very low concentration. a. Macro analysis b. Semi-macro analysis c. Micro analysis 18. Which of the following does not happen during digestion? The crystals dissolve and re-precipitate under equilibrium conditions. b. Weakly bound water are lost from the precipitates. c. Filterability improves d. None of the choices