Potassium permanganate, KMnO4, is standardized using high-quality sodium oxalate, Na2C2O4, inaccordance to the reaction:2 MnO4 + 16 H +5 C2042 → 2 Mn2+ +8 H2O + 10 CO2.A standard solution was prepared by dissolving 0.3562 g Na2C2O4 in water inside a volumetric flask. Themixture was diluted up to the 250.0-mL fiduciary mark. A 10.00 mL aliquot of the standard was analyzedand required 48.36 mL of KMnO4 to reach the colorless-to-pink end point.In correct significant figures, the molarity of KMnO4 is[NOTE: Just write the number. If your answer is 1.2345 x 10-67, use the format: 1.2345 x 10E-67. Thereis a space before and after the x.]

Answered: Potassium permanganate, KMnO4, is…

Chemistry & Chemical Reactivity

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Chapter20: Environmental Chemistry-earth's Environment, Energy, And Sustainability

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Problem 41PS

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According to the Resource Conservation and Recovery Act (RCRA), waste material is classified as toxic and must be handled as hazardous if the lead concentration exceeds 5 mg/L. By adding chloride ion, the lead ion will precipitate as PbCl2, which can be separated from the liquid portion. Once the lead has been removed, the rest of the waste can be sent to a conventional waste treatment facility. How many grams of sodium chloride must be added to 500 L of a waste solution to reduce the concentration of the Pb2+ ion from 10 to 5 mg/L?
Write balanced net ionic equations for the following reactions in acid solution. (a) Liquid hydrazine reacts with an aqueous solution of sodium bromate. Nitrogen gas and bromide ions are formed. (b) Solid phosphorus (P4) reacts with an aqueous solution of nitrate to form nitrogen oxide gas and dihydrogen phosphate (H2PO4-) ions. (c) Aqueous solutions of potassium sulfite and potassium permanganate react. Sulfate and manganese(II) ions are formed.
Cobalt metal can be prepared by reducing cobalt (II) oxide with carbon monoxide. CoO(s)+CO(g)Co(s)+CO2(g)Kc=4.90102 at 550 C
Iron (II) can be oxidized to iron (III) by dichromate ion, which is reduced to chromium (III) in acid solution. A 2.5000-g sample of iron ore is dissolved and the iron converted into iron(II). Exactly 19.17? ml. of 0.0100 M Na2Cr2O7 is required in the titration. What percentage of the ore sample was iron?
Write the balanced molecular chemical equation for the reaction in aqueous solution for cesium carbonate and magnesium nitrate. If no reaction occurs, write NR. CS2CO3 + Mg(NO3)2 →2 CSNO3 + M9CO3 04 02+03+ 4+ 3 6. 7 8. 6. 0. 口3||□4 Os 19 10 (s) (1) (g) (aq) Mg Mn N NR Cs 69°F O pe here to search 4- 2.
7
2+ Kidney stones can be indicated, in part, by elevated levels of calcium in urine. Ca is precipitated as CaC204 H20, filtered, washed, and titrated with standardized KMnO4 according to the reaction: 2 MnO4 + 16 H+ + 5 C2042-→ 2 Mn2+ +8 H2O + 10 CO2. A clinical technician obtained a 5.00-mL sample of urine from a patient. The calcium in urine was precipitated out as calcium oxalate, CaC204, and then subsquently dissolved in acid. The resultant mixture required 8.80 mL of 1.617 x 10 M KMnO4 to reach the colorless-to-pink end point. In correct significant figures, the molar concentration of Ca2+ in the urine sample is 7.115 X 10E-3 [NOTE: Just write the number. If your answer is 1.2345 x 10-67, use the format: 1.2345 x 10E-67. There is a space before and after the x.]
A permanganate solution is prepared by dissolving 20.0123 g KMNO4 in 500 mL of distilled water and boiled for 1 hour to remove any organic material. Following sintered-glass filtration, the solution is quantitatively transferred to a 1.0 L volumetric flask and diluted to volume with distilled water. The permanganate solution was titrated against 0.1023 M oxalic acid prepared in sulfuric acid solution. A 50.00 mL aliquot of oxalic acid solution required 16.68 mL of permanganate solution. A titration blank required 0.04 mL of permanganate. What is the permanganate molarity? 3. 5 H;C204 + 2 MnO¿ + 6H* s 10 CO2 + 2 Mn²* + 8 H2O
A permanganate solution is prepared by dissolving 20.0123 g KMNO4 in 500 mL of distilled water and boiled for 1 hour to remove any organic material. Following sintered-glass filtration, the solution is quantitatively transferred to a 1.0 L volumetric flask and diluted to volume with distilled water. The permanganate solution was titrated against 0.1023 M oxalic acid prepared in sulfuric acid solution. A 50.00 mL aliquot of oxalic acid solution required 16.68 mL of permanganate solution. A titration blank required 0.04 mL of permanganate. What is the permanganate molarity? 5 H2C204 + 2 MnO4 + 6H* s 10 CO2 + 2 Mn²* + 8 H2O
In one gravimetric analysis, the iron (Fe) in a 1.6374 g of impure iron compound was dissolved with nitric acid, HNO3 to oxidize iron. The precipitate will be formed as hydrous compound. The precipitate was then filtered, rinsed and ignited at 900°C to give anhydrous Fe2O3 weighed of 0.8994 g. Calculate the percentage by mass of Fe in a sample.
You were assigned to assay a product sample of milk of magnesia. A 0.600-g sample was reacted with 25.00 mL 0.10590 N H2SO4 . The excess unreacted acid in the solution required 13.00 mL of 0.09500 N NaOH when titrated to reach the methyl red end point. Determine the dosage strength of the product in terms of % Mg(OH)2 content. Type your answer in 2 decimal places, numbers only.
The following chemical reaction was performed in a laboratory to produce copper(I) iodide for a biochemistry investigation. Experimenters started with excess copper(Il) chloride, but a limited amount (855 mg) of potassium iodide. 2CuCl2 + 4KI → 2Cul + 4KCI + I, 1) Calculate the theoretical yield mass of copper(l) iodide, in milligrams. [ Select ] 2) In the lab, they were able to experimentally produce 326 mg of copper(I) iodide. What is the percent yield? [ Select ]

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