(b) Iodine is found in organic forms in plants and animals and in inorganic forms in...
(b) Iodine is found in organic forms in plants and animals and in inorganic forms in natural water samples. Using suitable equations, explain the effect of added iodide on the distribution ratio for the solvent extraction of iodine from water samples. [5 marks]
Homework Answers
Students observe iodine crystals dissolving in equal volumes of two immiscible solvents, aqueous potassium iodide and cyclohexane, and familiarize themselves with the different colours of the two solutions. To each solution they add the other solvent, and observe the gradual extraction of the iodine from one layer to the other until an equilibrium distribution is reached. If the quantity of iodine and the volume of each solvent are the same in both tubes, they should be able to observe that the same equilibrium position has been reached in both tubes. Using further volumes of the two solvents, they can demonstrate that it is possible to achieve almost complete extraction from one solvent to the other.
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(b) Iodine is found in organic forms in plants and animals and
in inorganic forms in...
(a) Sketch out, and explain the expected log D vs pH plot in the solvent extraction...
(a) Sketch out, and explain the expected log D vs pH plot in the solvent extraction of an organic amine RNH2 (pKa for RNH3 + = 9.5). [5 marks] (b) Iodine is found in organic forms in plants and animals, and in inorganic forms in natural water samples. Using suitable equations, explain the effect of added iodide on the distribution ratio for the solvent extraction of iodine from water samples. [5 marks]
(a) In liquid-liquid extraction, define and distinguish between (a) distribution constant and (b) distribution ratio [5...
(a) In liquid-liquid extraction, define and distinguish between (a) distribution constant and (b) distribution ratio [5 marks] (b) Using suitable equations, outline the pH dependency of extraction of a carboxylic acid (RCOOH) from water into an immiscible organic solvent.
During photosynthesis plants take in inorganic Co, and water converting them to organic compounds such as...
During photosynthesis plants take in inorganic Co, and water converting them to organic compounds such as glucose. Glucose can be utilized to produce energy or become stored in the form of starch in different parts of the plant. Some scientists wanted to learning more about the transporting system of plants, so they labeled the carbon atoms in the Co, so that they can trace their path through the plant's body. Which part of the vascular tissue of the plant you...
1. A student uses iodine to visualize cells under the light microscope. Iodine stains starch deep...
1. A student uses iodine to visualize cells under the light microscope. Iodine stains starch deep blue and glycogen granules dark brown. Observation of the cells reveals the presence of cell walls, dark brown granules, mitochondria, and a prominent nucleus. If the chemical composition of the cell wall is determined, which of the following molecules would MOST likely be the major constituent? A. cellulose B. chitin C. lignin D. peptidoglycan 2. Which of the following statements is the MOST compelling...
Inorganic phosphorous is a naturally occurring element in all plants and animals, with concentrations increasing progressively...
Inorganic phosphorous is a naturally occurring element in all plants and animals, with concentrations increasing progressively up the food chain (fruit < vegetables < cereals < nuts < corpse). Geochemical surveys take soil samples to determine phosphorous content (in ppm, parts per million). A high phosphorous content may or may not indicate an ancient burial site, food storage site, or even a garbage dump. The Hill of Tara is a very important archaeological site in Ireland. It is by legend...
14. Inorganic phosphorous is a naturally occurring element in all plants and animals, with concentrations increasing...
14. Inorganic phosphorous is a naturally occurring element in all plants and animals, with concentrations increasing progressively up the food chain. Geochemical surveys take soil samples to determine phosphorous content in ppm, parts per million). A high phosphorous content may or may not indicate an ancient burial site, food storage site, or even a garbage dump. The Hill of Tara is a very important archaeological site in Ireland. It is by legend the seat of Ireland's ancient high kingst. Independent...
4. Which of the following is not a source of drugs? a. Plants b. Animals c....
4. Which of the following is not a source of drugs? a. Plants b. Animals c. Minerals d. Microbiological sources All of the above This use of drugs relicves the symptoms while the body fights off the disease. a. Prevention 5. b. Cure c. Treatment d. Palliative e. Replacement 6. This use of drugs do not cure or treat the disease but improves a person's quality of life. a. Prevention b. Treatment c. Contraceptive d. Health maintenance e. Palliative uion,...
Hi! Can you please answer questions a and b for my organic lab report :) The...
Hi! Can you please answer questions a and b for my organic lab
report :) The pictures below the questions is my lab procedure.
Thank you
6. Analysis Questions: a) This lab utilized a new technique called reflux, and the use of a condenser tube while heating the reaction. What is the purpose of the condenser? Why not just heat the reaction in a closed vessel instead? b) A student misread the instructions and first refluxed the sodium methoxide in...
2. Catecholamine levels in plasma are diagnostically important in a number of diseases including Parkinson’s and...
2. Catecholamine levels in plasma are diagnostically important in a number of diseases including Parkinson’s and schizophrenia. Sketch out the chemistry behind the liquid-liquid extraction of catecholamines from plasma, and briefly explain the mechanisms involved. [5 marks] 3. You are investigating if a mineral water drink has been spiked with a weak organic acid drug substance (Ka = 5 x10-4 ). In order to extract the substance, you extract the aqueous sample with octanol. Calculate the distribution ratio D at...
1. What is the source of carbon for photosynthesis in plants? A. Carbonic acid B. Carbon...
1. What is the source of carbon for photosynthesis in plants? A. Carbonic acid B. Carbon monoxide C. Carbon Dioxide D. Calcium carbonate 2. H2CO3 forms when CO2 mixes with water. Why does it change the phenol red indicator to yellow? A. It is sodium carbonate, the color change shows a salt has formed. B. It is iron carbonate, it dissolves and releases iron which oxidizes (rusts). C. It is barium carbonate, which is naturally a dark yellow color. D....
During photosynthesis plants take in inorganic Co, and water converting them to organic compounds such as glucose. Glucose can be utilized to produce energy or become stored in the form of starch in different parts of the plant. Some scientists wanted to learning more about the transporting system of plants, so they labeled the carbon atoms in the Co, so that they can trace their path through the plant's body. Which part of the vascular tissue of the plant you...
Inorganic phosphorous is a naturally occurring element in all plants and animals, with concentrations increasing progressively up the food chain (fruit < vegetables < cereals < nuts < corpse). Geochemical surveys take soil samples to determine phosphorous content (in ppm, parts per million). A high phosphorous content may or may not indicate an ancient burial site, food storage site, or even a garbage dump. The Hill of Tara is a very important archaeological site in Ireland. It is by legend...
14. Inorganic phosphorous is a naturally occurring element in all plants and animals, with concentrations increasing progressively up the food chain. Geochemical surveys take soil samples to determine phosphorous content in ppm, parts per million). A high phosphorous content may or may not indicate an ancient burial site, food storage site, or even a garbage dump. The Hill of Tara is a very important archaeological site in Ireland. It is by legend the seat of Ireland's ancient high kingst. Independent...
4. Which of the following is not a source of drugs? a. Plants b. Animals c. Minerals d. Microbiological sources All of the above This use of drugs relicves the symptoms while the body fights off the disease. a. Prevention 5. b. Cure c. Treatment d. Palliative e. Replacement 6. This use of drugs do not cure or treat the disease but improves a person's quality of life. a. Prevention b. Treatment c. Contraceptive d. Health maintenance e. Palliative uion,...
Hi! Can you please answer questions a and b for my organic lab
report :) The pictures below the questions is my lab procedure.
Thank you
6. Analysis Questions: a) This lab utilized a new technique called reflux, and the use of a condenser tube while heating the reaction. What is the purpose of the condenser? Why not just heat the reaction in a closed vessel instead? b) A student misread the instructions and first refluxed the sodium methoxide in...
1. What is the source of carbon for photosynthesis in plants? A. Carbonic acid B. Carbon monoxide C. Carbon Dioxide D. Calcium carbonate 2. H2CO3 forms when CO2 mixes with water. Why does it change the phenol red indicator to yellow? A. It is sodium carbonate, the color change shows a salt has formed. B. It is iron carbonate, it dissolves and releases iron which oxidizes (rusts). C. It is barium carbonate, which is naturally a dark yellow color. D....
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