Calculate the amount (in mg) of calcium chloride per tablet if the sample powder weighing 0.2382 g required 16.52 mL of 0.1150 M EDTA for titration. The weight of 20 tablets taken was 7.75 g. Answer = ____ mg
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Calculate the amount (in mg) of calcium chloride per tablet if the sample powder weighing 0.2382 g required 16.52 mL of 0.1150 M EDTA for titration. The weight of 20 tablets taken was 7.75 g.
Answer = ____ mg
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- A 11.00 gram sample of Vodka was analysed for its alcohol content. The sample was placed in a300 mL volumetric flask and made to the mark with distilled water. A 20.0 mL aliquot of the dilutedVodka was taken from the volumetric flask and placed in a conical flask containing some distilled water from a previous washing.The 20.0 mL aliquots were titrated against a 0.1302 M Cr2O72-solution and an average titre of13.25 mL was obtained.The reaction between the alcohol and the dichromate solution is given below2Cr2O72–(aq) + 3CH3CH2OH(aq) + 16H+(aq) 4Cr3+(aq) + 3CH3COOH(aq) + 11H2O(l)a) Calculate the amount in mol of Cr2O72– in the average titre. b) Calculate the percentage, by mass, of ethanol in the vodka.For breakfast, the nihilistic Rick Sanchez ate 100 g of cereal mixed with 20 g of milk. A 1.500 g sample of the same cereal was analyzed using the Kjeldahl method, and the liberated NH3 was distilled into 50 mL of a 0.0227 M HCl solution, and back-titrated with 2.85 mL of 0.0112 M NaOH solution. A 1.100 g sample of milk was also analyzed, and the liberated NH3 was distilled into 55 mL of a 0.0234 M HCl solution, and back-titrated with a 3.10 mL of 0.0121 M NaOH. Use the values: MM N=14.07 g/mol. meat= 6.25 dairy= 6.38 cereal= 5.70 What is the % protein in the cereal sample? What is the % protein in the milk sample?For breakfast, the nihilistic Rick Sanchez ate 100 g of cereal mixed with 20 g of milk. A 1.500 g sample of the same cereal was analyzed using the Kjeldahl method, and the liberated NH3 was distilled into 50 mL of a 0.0227 M HCl solution, and back-titrated with 2.85 mL of 0.0112 M NaOH solution. A 1.100 g sample of milk was also analyzed, and the liberated NH3 was distilled into 55 mL of a 0.0234 M HCl solution, and back-titrated with a 3.10 mL of 0.0121 M NaOH. Use the values: MM N=14.07 g/mol. meat= 6.25 dairy= 6.38 cereal= 5.70 1. What is the % protein in the cereal sample? a. 5.90% protein b. 10.21% protein c. 11.80% protein d. 20.42% protein 2. What is the % protein in the milk sample? a. 5.90% protein b. 10.21% protein c. 11.80% protein d. 20.42% protein 3. How many grams of protein did Rick consume over-all? a. 3.749 g b. 7.942 g c. 5.901 g d. 10.21 g
- 1) In the standardization of a sodium hydroxide (NaOH) solution, 1.0211g of potassium biphthalate C6H4COOHCOOK (MM = 204.22 g mol-1) was analytically weighed and transferred to a 250 ml Erlenmeyer flask. In the titration, 25.00mL of NaOH were used. a) What is the concentration (mol / L) of NaOH? b1:0.0 mL; b2:5.00 mL; b3:10.00 mL; b4:11.00 mL; b) 20.00 ml of a 0.1000mol/L hydrochloric acid solution (HCl) were titrated with the NaOH solution standardized above. For this titration, calculate the pH of the solution when the volume of NaOH added is equal to: c)Using the values obtained in b, sketch the titration curve (pH vs. NaOH volume). d) Knowing that the pH range for turning the color of the cresol red indicator is between 7.2 to 8.8 explains whether or not it can be useful for the titration of HCl with NaOH.Show complete solution. Round-off your answers to four decimal places The amount of copper in a wire was determined by a redox titration using KMnO4 as the titrant. A 0.4185-g sample was dissolved in acid and the liberated Cu2+ quantitatively reduced to Cu+, using a reductor column. Titrating with 0.0250 M KMnO4 requires 41.27 mL to reach the endpoint. Determine the % w/w CuO in the sample of meteorite. Answer: % CuO = ______I add 0.1011 g of a primary standard FAS into a volumetric flask and diluted it to the line with water. We then add 2 mL of that solution into another 100 mL volumetric flask and diluted to the line with water. What would be the concentration of the diluted solution in g/mL?
- A 1.000-g sample containing KHC2O4, H2C2O4, and impurities required 46.48 mL of 0.0980 M NaOH for titration. A duplicate sample required 48.33 mL of 0.0220 M KMnO4 for titration in acid solution, according to the reaction: 5C2O42- + 2MnO4- + 16H+ → 2Mn2+ + 10CO2 + 8H2O. Calculate the percentages of KHC2O4 (128.13) and H2C2O4 (90.04) in the sample.When standardizing two liters of a potassium permanganate solution, approximately 0.0100 M, with a primary standard solution of sodium oxalate, it was planned to use between 30.00 and 45.00 ml of the titrated reagent. In which mass range (in grams) the primary standard should be weighed?1. What is used to change the chemical form of some precipitate that do not have a constant composition after drying? 2. If 2.376 g of steel gave 0.402 g Ni(DMG)2, what is the wt. % Ni in the steel? (Express your answer to 4 significant figures.) MMNi = 58.69 MMDMG = 116.12 MMNi(DMG)2 = 288.91