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- QUESTION 4 To prevent inclusion from occurring during precipitation, the technique to follow is I. fiter precipitate with less porous paper II. crystal growth be made to occur more slowly III. use of dilute analyte with concentrated precipitant IV. addition of soluble electrolyte O lonly IV only O I| & IV O I & III Il onlyThe concentration of ammonia in a cleaning product was determined by back titration.Firstly, 10.00 cm3 of the cleaning product was pipetted into a large conical flask,containing 250.00cm3 of 0.50 mol/l HCl to give Solution A.Following a period of reaction and shaking, 50.00cm3 of Solution A was removed anddiluted to 250 cm3 with water in a volumetric flask to give Solution B.20 cm3 samples of Solution B were titrated against 0.05 mol/l Na2CO3 solution, givingan average titre of 12.45 cm3. i) Write equations for the reactions that have taken place.ii) Determine the concentration of NH3 in the original cleaning product in mol/l,g/l, ppm, and % w/v.To prevent inclusion from occurring during precipitation, the technique to follow is I. filter precipitate with less porous paper II. crystal growth be made to occur more slowly II. use of dilute analyte with concentrated precipitant IV. addition of soluble electrolyte O I & II I O I l only O Iv only O II & IV O I only
- 1The Kjeldahl method was used to analyse the nitrogen content in 0.6723 g of food sample. The amount of liberated NH3 in the sample was reacted with 50.0 mL of 0.1050 M HCl. The excess acid required 12.35 mL back titration with 0.0915 M NaOH. Calculate the % nitrogen in the sample.1. One of the methods of eliminating interferences, is by adding solvents to the solution in which components to be removed are soluble, which method is this? a. Complexation b. Extraction lon-exchange d. Precipitate С. 2. Which of the following properties of precipitates is desired in gravimetry? a. Large b. Pure С. Free of contaminants d. All of the choices
- 1. Differentiate the Faians method from the Volhard method of precipitation titrimetry, Include key information such as indicator used, endpoint, analytes, and the chemical reactions.A 0.1093-g sample of impure Na2CO3 was analyzed by the Volhard Method. After adding 50.00 mL of 0.06911 M AGNO3, the sample was back titrated with 0.05781 M KSCN, requiring 27.36 mL to reach the end point. Report the purity of Na2CO3 sample.A 0.1093-g sample of impure Na2CO3 was analyzed by the Volhard Method. After adding 50.00 mL of 0.06911 M AgNO3, the sample was back titrated with 0.05781 M KSCN, requiring 27.36 mL to reach the end point. Report the purity of Na2CO3sample.
- A 0.1093-g sample of impure Na2CO3 was analyzed by the Volhard method. After adding 50.00 mL of 0.06911 M AgNO3, the sample was back-titrated with 0.05781 M KSCN, requiring 27.36 mL to reach the endpoint. Report the purity of the Na2CO3 sample. [Ans. 90.9 % (w /w )]Chemistry A 0.3500 g sample of impure KI is treated with 0.1942g of pure K2CrO4 and the solution is boiled to expel all of the liberated iodine. The cooled solution is then treated with excess KI and the liberated I2 titrated with 0.100N sodium thiosulfate, requiring 10.00ml. Find the percentage purity of the original sample of KIA 0.3500-g sample of impure Kl is treated with 0.1942 g of pure K2CrO4 and the solution is boiled to expel all of the liberated iodine. The cooled solution is then treated with excess KI and the liberated l2 titrated with 0.100 N sodium thiosulfate, requiring10.00 mL. Find the percentage purity of the original sample of Kl.