In a test tube add a few trops off sulfuric acid to 3g of MnSO4 . After that add 2-3 drops of Silver nitrate solution in the end add 2 g of K2S2O8. Give the reaction equation.
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- A chemist dissolves a 1.497-g sample of a type of metal (an alloy of Sn, Pb, Sb, and Cu) in nitric acid, and metastannic acid, H2SnO3, is precipitated. She heats the precipitate to drive off the water, which leaves 0.4909 g of tin(IV) oxide. What was the percentage of [in in the original sample?A stock solution containing Mn2+ ions was prepaned by dissolving 1.584 g pure manganese metal in nitric acid and diluting to a final volume of 1.000 L. The following solutions were then prepared by dilution: For solution A, 50.00 mL of stock solution was diluted to 1000.0 mL. For solution B, 10.00 mL of solution A was diluted to 250.0 mL. For solution C, I 0.00 mL of solution Bwas diluted to 500.0 mL. Calculate the concentrations of the stock solution and solutions A,B, and C.a chemist reacts 45.0 mL of 3.4 M AgNO3 with an excess of Na2CrO4. How many grams of silver chromate will be produced?
- An ore is analyzed for manganese content gt converting the manganese to Mn3O4 and weighing it. If a 1.52 g sample yields Mn3O4 weighing 0.126 g, what would be the Mn2O3% in th sample? Mn% in the sample?A 1.500 g sample of iron ore, labeled A, was processed accordingly to give 0.5215 g of pure Fe2O3 (159.69 g/mol). A second sample of iron ore, labeled B, weighed 1.750 g and gave 0.5097 g of pure Fe2O3.0.1745 g of primary standard Na2C2O4 is used to set a freshly prepared KMnO4 solution and 30.24 mL of KMnO4 solution is spent at the turning point. Since 36.92 mL of this KMnO4 solution is consumed for the determination of iron in 0.5618 g ore sample, calculate the amount of iron in the ore in terms of % iron (III) oxide and % iron (III) chloride. (Fe: 56, K: 39, Mn: 55, O: 16, Na:23, C: 12, Cl: 35.5 g/mol) (Please type answer)
- A sample of magnetite (impure Fe3O4) weighing 0.4500 g is fused with oxidizing flux and the ferric compound formed is eventually precipitated as ferric hydroxide and ignited to ferric oxide (Fe2O3MM 159.70 g/mol) which weighs 0.4890 g. Calculate % Fe. At. mass Fe 55.85 O 16.00Gold can be determined in solutions containing high concentrations of diverse ions by ICP. Aliquots of 50.0 mL of the sample solution were transferred to each of four 100.0 mL volumetric flasks. A solution was prepared containing 10.0 mg/L Au in 20% H2SO4, and quantities of this solutions were added to the sample solution to give 0, 2.5, 5 and 10 mg/L added Au in each of the flask. The solutions were made up to a total volume of 100.0 mL, mixed and analyzed by ICP. The resulting data are presented in the following table: Added Au (mg/L) Emission Intensity (Counts) 0.0 12568 2.5 19324 5.0 26622 10.0 40021 a) Attach an excel graph for the determination showing the X intercept. b) Calculate the concentration of gold in the sample, report with its uncertainty. c) The known concentration of gold in the sample is 8.51 mg/L. Test the hypothesis that your result is equal to this value at the 95% confidence level. lconcentrate of AgNO3 is 0.02
- 100.0 g of a ground mineral sample consisting of a mixture of MgCO₃ (magnesite) and BaCO₃ (witherite) was heated to completely convert the carbonates to their metal oxides. After the reaction 57.35 g of the metal oxide mixture was obtained. What was the mass of MgCO₃ in the original sample?The amount of protein in a sample of cheese is determined by a Kjeldahl analysis for nitrogen. After digesting a 0.9814g sample of cheese, the nitrogen is oxidized to NH4+, converted to NH3 with NaOH, and distilled into a collection flask containing 50.00 mL of 0.1047 M HCl. The excess HCl is then back titrated with 0.1183 M NaOH, requiring 22.84 mL to reach the bromothymol blue end point. Report the %w/w protein in the cheese given that there is 6.38 g of protein for every gram of nitrogen in most dairy products.5. A 0.5664 g ore sample is dissolved in nitric acid and then filtered. The aluminum is present in solution as Al3+. The solution is made basic with ammonium hydroxide, NH4OH, and the aluminum hydroxide, Al(OH)3 (FW 78.004), precipitates. This gel is filtered in a porous glass crucible, rinsed with dilute ammonium hydroxide, ignited, cooled in a desiccator, and weighed. The resulting alumina, Al2O3 (FW 101.94), weighed 0.1605 g. Why is the solution filtered after acid dissolution? To remove insoluble matrix material (like sand, etc.) 6. In #5, why rinse with ammonium hydroxide solution? To avoid peptization or loss of precipitate. Ammonium hydroxide is a volatile electrolyte. 7. In #5, what chemical transformation takes place during ignition? (Show the balanced chemical equation) 2Al(OH)3 -> Al2O3 + 3H2O 8. In #5, why use a desiccator during cooling? To avoid weight gain by adsorption of atmospheric water. 9. In #5, calculate the weight percent Al (AW 26.9815) in the sample.