(a) Potassium iodate solution was prepared by dissolving 1.022 g of KIO3 (FM 214.00) in a...
(a) Potassium iodate solution was prepared by dissolving 1.022 g of KIO3 (FM 214.00) in a 500 mL volumetric flask. Then 50.00 mL of the solution was pipetted into a flask and treated with excess KI (2 g) and acid (10 mL of 0.5 M H2SO4). How many millimoles of I3− are created by the reaction? ANSWER is 1.433 mmol
(b) The triiodide from part (a) reacted with 37.54 mL of Na2S2O3 solution. What is the concentration of the Na2S2O3solution?
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(a) Potassium iodate solution was prepared by dissolving 1.022 g
of KIO3 (FM 214.00) in a...
(a) Potassium iodate solution was prepared by dissolving 1.022 g of KIO3 (FM 214.00) in a...
(a) Potassium iodate solution was prepared by dissolving 1.022 g of KIO3 (FM 214.00) in a 500 mL volumetric flask. Then 50.00 mL of the solution was pipetted into a flask and treated with excess KI (2 g) and acid (10 mL of 0.5 M H2SO4). How many millimoles of I3− are created by the reaction? (b) The triiodide from part (a) reacted with 37.54 mL of Na2S2O3 solution. What is the concentration of the Na2S2O3 solution? (c) A 1.223...
A 0.1358-g portion of potassium iodate (MW 214.00), about 2 g of potassium iodide, and 2...
A 0.1358-g portion of potassium iodate (MW 214.00), about 2 g of potassium iodide, and 2 mL of 6 M hydrochloric acid were dissolved in 25 mL of distilled water. The triiodide formed during the ensuring reaction was titrated to the starch endpoint with 31.94 mL of a thiosulfate solution. A 25.00-mL triiodide sample solution was titrated to the endpoint with 21.33 mL of the standardized thiosulfate solution. Calculate the concentrations of the thiosulfate solution and the triiodide solution.
0.6573 g of potassium iodate is dissolved and diluted to a volume of 100.0 mL. Then...
0.6573 g of potassium iodate is dissolved and diluted to a volume of 100.0 mL. Then 25.00 mL of this stock solution is pipetted into a 100.0 mL volumetric flask which is filled to the mark with water. What is the concentration of the final standard solution in mol/L? Include units in your answer, and round the final answer to the correct number of significant figures.
4. a) A solution of potassium hypochlorite (KOCI) is prepared by dissolving 0.61 g of potassium...
4. a) A solution of potassium hypochlorite (KOCI) is prepared by dissolving 0.61 g of potassium hypochlorite in water in a 250 cmº volumetric flask and making up to the mark. What is the molarity of the solution? b) A 10 cm3 aliquot of the potassium hypochlorite solution is added to a conical flask containing an excess of potassium iodide thus generating molecular iodine (12) according to the following reaction: KOCI + 2HCl + 2K1 + 3KCl + H2O +...
Determine the molarity of a solution of potassium chloride that is prepared by dissolving 1.4753 g...
Determine the molarity of a solution of potassium chloride that is prepared by dissolving 1.4753 g of KCl in a 100-mL volumetric flask and filling it to the calibration mark with deionized water. Use a molar mass with at least 4 significant figures so that the number of SF in the calculated molarity is not limited. Show all calculations (including labeled conversion factors) and express the answer with the appropriate number of significant figures. According to the manufacturer, the volume...
A solution was prepared by dissolving 203mg of potassium sulfate (K2SO4, MW = 174.24 g/mol) in...
A solution was prepared by dissolving 203mg of potassium sulfate (K2SO4, MW = 174.24 g/mol) in 565 mL of water. Use this information to calculate each quantity. a. Moles of K2SO4 = ? mol b. Millimoles of K2SO4 = ? mmol c. [K2SO4] = ? M d. [K+] = ? M e. [SO4 2-] = ? M f. ppm K2SO4 = ? ppm g. % (w/v) K2SO4 = ? %(w/v) h. pK+ = i. pSO4 2- =
4. a) A solution of potassium hypochlorite (KOCI) is prepared by dissolving 0.61 g of potassium...
4. a) A solution of potassium hypochlorite (KOCI) is prepared by dissolving 0.61 g of potassium hypochlorite in water in a 250 cm3 volumetric flask and making up to the mark What is the molarity of the solution? b) A 10 cm aliquot of the potassium hypochlorite solution is added to a conical flask containing an excess of potassium iodide thus generating molecular iodine (l2) according to the following reaction: KOCI2HCI2KI 3KCI HO l2 The iodine is then titrated against...
A standard iron solution was prepared by dissolving 0.0100 g of pure iron in acid then...
A standard iron solution was prepared by dissolving 0.0100 g of pure iron in acid then transferring to a 50.00 mL volumetric flask with orthophenanthroline as a complexing agent. At a wavelength of 540 nm, the absorbance of the standard was 0.239 in a 1.00 cm cuvette. A 0.149 g sample of an iron ore was crushed and digested in 5 mL of concentrated acid. The digested sample was then transferred to a 10.00 mL volumetric flask and diluted to...
1. An aqueous solution of potassium thiosulfate is prepared by dissolving 3.70 g of potassium thiosulfate...
1. An aqueous solution of potassium thiosulfate is prepared by dissolving 3.70 g of potassium thiosulfate in 7.11×102 g of water. The density of the solution is 1.37 g mL-1. a) Determine the mass percent of potassium thiosulfate in the solution. b) Determine the mole fraction of potassium thiosulfate in the solution. 2. An aqueous solution of potassium bromide is prepared by dissolving 8.75 g of potassium bromide in 8.29×102 g of water. The density of the solution is 1.20...
A stock solution was prepared by dissolving 0.593 g of pure ASA (molar mass = 180.2...
A stock solution was prepared by dissolving 0.593 g of pure ASA (molar mass = 180.2 g/mol) with NaOH solution and diluting with water in a 1000 mL volumetric flask. This was followed by pipetting 4.00 mL of the stock solution into flask A and 5.0 mL of the stock into flask B. Flasks A and B were each diluted to 20 mL mark of the volumetric flask. What are the concentrations, in molarity, of ASA in flasks A and...
4. a) A solution of potassium hypochlorite (KOCI) is prepared by dissolving 0.61 g of potassium hypochlorite in water in a 250 cmº volumetric flask and making up to the mark. What is the molarity of the solution? b) A 10 cm3 aliquot of the potassium hypochlorite solution is added to a conical flask containing an excess of potassium iodide thus generating molecular iodine (12) according to the following reaction: KOCI + 2HCl + 2K1 + 3KCl + H2O +...
4. a) A solution of potassium hypochlorite (KOCI) is prepared by dissolving 0.61 g of potassium hypochlorite in water in a 250 cm3 volumetric flask and making up to the mark What is the molarity of the solution? b) A 10 cm aliquot of the potassium hypochlorite solution is added to a conical flask containing an excess of potassium iodide thus generating molecular iodine (l2) according to the following reaction: KOCI2HCI2KI 3KCI HO l2 The iodine is then titrated against...
A standard iron solution was prepared by dissolving 0.0100 g of pure iron in acid then transferring to a 50.00 mL volumetric flask with orthophenanthroline as a complexing agent. At a wavelength of 540 nm, the absorbance of the standard was 0.239 in a 1.00 cm cuvette. A 0.149 g sample of an iron ore was crushed and digested in 5 mL of concentrated acid. The digested sample was then transferred to a 10.00 mL volumetric flask and diluted to...
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