Dentists frequently use a 2% sodium fluoride solution in water to prevent tooth decay. Illustrate the...
Dentists frequently use a 2% sodium fluoride solution in water to prevent tooth decay. Illustrate the manner by which a unit of sodium fluoride forms from atoms of the elements sodium and fluorine?
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Dentists frequently use a 2% sodium fluoride solution in water
to prevent tooth decay. Illustrate the...
A liquid feeder applies a 4% saturated sodium fluoride solution to drinking water. This liquid feeder...
A liquid feeder applies a 4% saturated sodium fluoride solution to drinking water. This liquid feeder increases the fluoride concentration from the natural background level of 0.4 mg F/liter to 1 mg F/liter. The commercial sodium fluoride powder contains 45% F by weight. Determine: 1. The pounds of NaF required per million gallons of water treated. 2. The dosage of 4% NaF solution per million gallons.
Sodium fluoride is often added to municipal water supplies to support dental health. In a typical sys- tem, a tank of high-pressure sodium fluoride solution (η = 4.5 × 10−3 Pa · s) is connected throug...
Sodium fluoride is often added to municipal water supplies to support dental health. In a typical sys- tem, a tank of high-pressure sodium fluoride solution (η = 4.5 × 10−3 Pa · s) is connected through a narrow flow restricting tube to the main water flow. The flow- restriction tube is one meter long and has an internal diameter of 2 mm. The total water flow for through the main pipe is 2 m3/s and the fluoride solution should be...
An aqueous solution of sodium fluoride is slowly added to a water sample that contains barium ion (4.65x10-2 M)
An aqueous solution of sodium fluoride is slowly added to a water sample that contains barium ion (4.65x10-2 M) and calcium ion (7.40x10-2 M).The Ksp of barium fluoride is 1.00x10-6. The Ksp of calcium fluoride is 3.90x10-11. What is the remaining concentration of the first ion to precipitate when the second ion begins to precipitate?
Use a volumetric pipet to deliver 2 mL of 4 M sodium hydroxide solution to each...
Use a volumetric pipet to deliver 2 mL of 4 M sodium hydroxide solution to each of seven 100-mL volumetric flasks. Add 2,4, 6, 8, and 10 mL, respectively, of the salicylic acid stock solution to 5 of the labeled flasks. Calculate the concentrations of the standard solutions. Use a pipet to place 10 mL of the unknown solution into another volumetric flask and label Unknown 1. Dilute each solution to the mark with DI water. The seventh flask that...
2. What is the volume of sterile purified water and 0.9% w/v sodium chloride solution needed to prepare 30 mL of...
2. What is the volume of sterile purified water and 0.9% w/v sodium chloride solution needed to prepare 30 mL of a 2% w/v solution of tobramycin for ophthalmic use? • Step 1: Calculate the tonic contribution provided by the tobramycin (FDP 1% tobramycin = 0.04°C) Step 2: Calculate the amount of NaCl necessary to render this product isotonic Step 3: Your source of NaCl is 0.9% NaCl. What volume of the 0.9% NaCl solution will yield the calculated amount...
Purifying Mg2+ from sea water. Aqueous sodium hydroxide is added to an aqueous solution that contains...
Purifying Mg2+ from sea water. Aqueous sodium hydroxide is added to an aqueous solution that contains 0.0099 M magnesium chloride and 0.021 M calcium chloride. What will be the concentration of the metal ion that precipitates first (as M(OH)2) at the time the second metal ion begins to precipitate? Ksp (Mg(OH)2) = 6.3 x 10-10 and Ksp (Ca(OH)2) = 6.5 x 10-6 Hint: Use Ksp values to determine the solubility of each product to determine the order of precipitation.
Q. 3. Potassium fluoride adopts the rock salt (NaCl type) structure, with a density of 2.48...
Q. 3. Potassium fluoride adopts the rock salt (NaCl type) structure, with a density of 2.48 g/cm3. Using the data for the Part 4 model you constructed, calculate the expected distance between the center of the potassium ion and the center of an adjacent fluoride ion in pm. Q. 4. The diameter of a Cs+ ion is 334 pm; the diameter of a Br- ion is 392 pm. For CsBr, which crystallizes in the CsCl type structure from Part 5,...
13. Hydrogen Fluoride (HF) is a covalentens It is: ANonpolar B. Polar 14. Would you expect...
13. Hydrogen Fluoride (HF) is a covalentens It is: ANonpolar B. Polar 14. Would you expect water to dissolve Hydrogen Fluoride? A. Yes B. No 15. What is the best equation for the dissociation (ionization) using HF instead of HCl, understanding that HF is a WEAK electrolyte (and acid). A. HF(g) + H2O(l) HF (aq) B. HF(g) + H2O(1) - H +F C. HF(g) + H2O(l) HUF 16. You dissolve 1 mole of HF(g) in water and bring the volume...
Post-lab question Part A 1. Metallic sodium forms a body centered cubic crystal. Why would the...
Post-lab question Part A 1. Metallic sodium forms a body centered cubic crystal. Why would the water displacement method used in part A not be suitable to determine the density of sodium? (Hint: watch the following video to help you answer this question: https://www.youtube.com/watch?v=18tOtZKpi04) 2. Calculate the density of sodium. (The radius of a sodium atom is 186pm) Post-lab Question Part B: Consider cubic array iodide ions (r =220pm) in which the anions are touching along the face of the...
9. Then add slowly while mixing 1 mL of saturated sodium bicarbonate solution (NaHCO3) -IT WILL...
9. Then add slowly while mixing 1 mL of saturated sodium bicarbonate solution (NaHCO3) -IT WILL BUBBLE! Add additional drops of saturated sodium bicarbonate solution with mixing until no additional bubbling occurs Congratulations! You have just made your first ester. Now you want to separate your ester product from the other stuff in the reaction mixture. CTQ3 Sodium bicarbonate is a base. How will it interact with any carboxylic acid molecules still present in your reaction mixture? 10. Add 1mL...
Use a volumetric pipet to deliver 2 mL of 4 M sodium hydroxide solution to each of seven 100-mL volumetric flasks. Add 2,4, 6, 8, and 10 mL, respectively, of the salicylic acid stock solution to 5 of the labeled flasks. Calculate the concentrations of the standard solutions. Use a pipet to place 10 mL of the unknown solution into another volumetric flask and label Unknown 1. Dilute each solution to the mark with DI water. The seventh flask that...
2. What is the volume of sterile purified water and 0.9% w/v sodium chloride solution needed to prepare 30 mL of a 2% w/v solution of tobramycin for ophthalmic use? • Step 1: Calculate the tonic contribution provided by the tobramycin (FDP 1% tobramycin = 0.04°C) Step 2: Calculate the amount of NaCl necessary to render this product isotonic Step 3: Your source of NaCl is 0.9% NaCl. What volume of the 0.9% NaCl solution will yield the calculated amount...
13. Hydrogen Fluoride (HF) is a covalentens It is: ANonpolar B. Polar 14. Would you expect water to dissolve Hydrogen Fluoride? A. Yes B. No 15. What is the best equation for the dissociation (ionization) using HF instead of HCl, understanding that HF is a WEAK electrolyte (and acid). A. HF(g) + H2O(l) HF (aq) B. HF(g) + H2O(1) - H +F C. HF(g) + H2O(l) HUF 16. You dissolve 1 mole of HF(g) in water and bring the volume...
Post-lab question Part A 1. Metallic sodium forms a body centered cubic crystal. Why would the water displacement method used in part A not be suitable to determine the density of sodium? (Hint: watch the following video to help you answer this question: https://www.youtube.com/watch?v=18tOtZKpi04) 2. Calculate the density of sodium. (The radius of a sodium atom is 186pm) Post-lab Question Part B: Consider cubic array iodide ions (r =220pm) in which the anions are touching along the face of the...
9. Then add slowly while mixing 1 mL of saturated sodium bicarbonate solution (NaHCO3) -IT WILL BUBBLE! Add additional drops of saturated sodium bicarbonate solution with mixing until no additional bubbling occurs Congratulations! You have just made your first ester. Now you want to separate your ester product from the other stuff in the reaction mixture. CTQ3 Sodium bicarbonate is a base. How will it interact with any carboxylic acid molecules still present in your reaction mixture? 10. Add 1mL...
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