Oxalate was used as the precipitating agent in the gravimetric analysis of magnesium. A. Mass of the residue after ignition to 100°C B. Mass of the residue after ignition to 1000°C |> | |< | Cannot be compared
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- + H (a) CuCN (b) CaCO3 (c) Ag₂CO3 (d) PbBr₂ (e) Y(OH)3 Periodic Table B W Chapter... Supporting Materials Additional Materiala [Ca²+] = 5.2 x 104 M, [CO32- ] = 6.5x 10-6 M * G Please use the values in the resources listed below instead of the textbook values. The following concentrations are found in mixtures of ions in equilibrium with slightly soluble solids. From the concentrations given, calculate Ksp for each of the slightly soluble solids indicated. [Cu] = 1.9x10-10 M, [CN] = 1.9x10-¹0 M [Ag+] = 1.8x10-5 M, [CO32] = 2.7x10-² M [Pb²+] = 1.2x 10-2 M, [Br] = 2.4x10-2 M [Y³+] = 3.5x 10-16 M, [OH-] = 6.6x 10-³ M Constants and Factors №. webassign.net ● F 893 Supplemental Data L C C a Ⓒ + D r56EF3A79haQqAAmRHdBhZQvrwNmdPsuA4 Ing and Conditions Subject Test pard Note: - You are attempting question 5 out of 12 To find the Ce content of a solid, 4.37 g were dissolved and treated with excess iodate to precipitate Ce (IO,),. The precipitate was collected, washed well, dried, and ignited to produce 0.104 g of CeO, (FM: 172.114). What was the weight percent of Ce in the original solid? (A) 1.84% (B) 1.49% (C) 1.94% (D) 1.74% Answer A B Submit P Type here to search 王 立Name: Date: Section: Data Report Sheet: Determination of Iron by Reaction with Permanganate: A Titration Unknown # We 01 X E Trial I Trial II III [BL Mass of Unknown 0.512 Initial Burette mL 0.00 mL Final Burette mL 20.5mL mL 0.2 Total MnO, Added Moles MnO, Added Moles Fe?+ Present Grams Fe²* Present Weight % Fe Average Weight % Fe in Sample
- Data Report Sheet: Quantitative Analysis of Group I Cations Observations on Standard Solution: Part B: Part C: Part D: Unknown Unknown # 89 Redraw the flow chart for this experiment and record you observations for each step. Ions Present in Unknown:For Redox Analysis of Iron... ~0.02 M of potassium dichromate is prepared as titrant for dried unknown. ~.3 g of sample, 50ml of 6M HCl, 20mL SnCl2, 10 mL of saturated HgCl2 solution, 60 mL of 3M H2SO4, 15mL of concentrated H3PO4, 100mL DI water. HCl (+ heat in fumehood until samples dissolves), SnCl2 (added with pipet until solution changes from yellow to colorless/light green with 3 drops in excess), HgCl2 (after cooling), H2SO4, H3PO4, DI Water, is added to the sample solution with 8 drops of diphenylamine sulfonate indicator then titrated with the potassium dichromate to a violet blue endpoint. 4. Why is it necessary to carry out the reduction of iron and then the titration, before going on to the next sample 5. If you look carefully, there are pieces of tin metal on the bottom of the SnCl2 reagent solution. Why is it there?For Redox Analysis of Iron... ~0.02 M of potassium dichromate is prepared as titrant for dried unknown. ~.3 g of sample, 50ml of 6M HCl, 20mL SnCl2, 10 mL of saturated HgCl2 solution, 60 mL of 3M H2SO4, 15mL of concentrated H3PO4, 100mL DI water. HCl (+ heat in fumehood until samples dissolves), SnCl2 (added with pipet until solution changes from yellow to colorless/light green with 3 drops in excess), HgCl2 (after cooling), H2SO4, H3PO4, DI Water, is added to the sample solution with 8 drops of diphenylamine sulfonate indicator then titrated with the potassium dichromate to a violet blue endpoint. 3. How would you prepare a complete anlaysis procedure using KMnO4 as the oxidant instead of K2CrO7? Include sample and solution preparation, approximate weights of samples and reagents, procedure and chemical reactions. In particular what is the purpose of the Zimmerman Reinhardt Reagent?
- E. Analysis of a mixture consisting of NaOH + NażCO3 + inert matter gives the following data: Sample portions are titrated. With one portion, an end point with phenolphthalein is obtained in cold solution, with 44.52 mL of 0.5000 N HCI. The other portion requires 46.53 mL of the acid for an end point with methyl orange. Calculate the percentage composition of the original sample. 10.00 g. Its aqueous solution is diluted to 250.0 mL and two separate 25.00 mLFor Redox Analysis of Iron... ~0.02 M of potassium dichromate is prepared as titrant for dried unknown. ~.3 g of sample, 50ml of 6M HCl, 20mL SnCl2, 10 mL of saturated HgCl2 solution, 60 mL of 3M H2SO4, 15mL of concentrated H3PO4, 100mL DI water. HCl (+ heat in fumehood until samples dissolves), SnCl2 (added with pipet until solution changes from yellow to colorless/light green with 3 drops in excess), HgCl2 (after cooling), H2SO4, H3PO4, DI Water, is added to the sample solution with 8 drops of diphenylamine sulfonate indicator then titrated with the potassium dichromate to a violet blue endpoint. 1. What is the purpose of the phosphoric acid in this experiment? Please be specific. 2. How does the Diphenylamine sulfonate indicator work? What chemical reaction causes the color change? How is an indicator chosen in a redox reaction?2. In one gravimetric analysis, the aluminum in a 1.2g sample of impure NHAI(SO4)2 was precipitate as hydrous ALO3.XH2O. The precipitate was filtered and ignited at 1000 °C to give anhydrous Al2O3 which weighed 0.1798g. Calculate the % Al inthe sample. 3. A sample of 0.4500g impure potassium chloride was dissolved in water treated with excess silver nitrate solution. 0.8402 g of silver chloride was precipitated. What is the percentage of potassium chloride in the sample?
- H.W 1) Calculate the number of meq. of H;C:O..2H;0 (fw= 126.1) in 0.5 gm of the pure compound assuming that two hydrogen ions to titrated with standard base? 2) A standard AGNO, solution prepared by weighting exactly 24.15 gm of carefully prepared solid, dissolving in water and diluting in a volumetric flask to exactly 2 L. What normality of the solution?Which of the following is not a feature that primary standard substances should have.A. must be of high purityB. must be of low molecular weightC. must be stable in airD. must dissolve sufficiently in titration mediumA 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.