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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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.
Consider the equation G = -nF. What are the four terms in this equation? Why does a minus sign appear in the equation? What does the superscript o indicate?
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?
1) The net ionic equation for formation of an aqueous solution of Nil2 accompanied by evolution of Coz gas via mixing solid NICO3 and aqueous hydriodic acid is A) 2NICO, (s) + HI (aq) → 2H,O (1) + CO, (g) + 2Ni (aq) B) NİCO, (s) + I- (aq) → 2H,O (1) + CO, (g) + Ni* (aq) + HI (aq) C) NICO, (s) + 2H* (aq) → H,O (1) + CO, (g) + Ni* (aq) D) NICO, (s) + 2HI (aq) → 2H,O (1) + CO, (g) + Nil (aq) E) NICO, (s) + 2HI (aq) → H,O (1) + CO, (g) + Ni* (aq) + 21 (aq) Answer: C 2) The net ionic equation for formation of an aqueous solution of Al(NO,), via mixing solid Al(OH); and aqueous nitric acid is A) Al(OH), (s) + 3HNO, (aq) 3H,0 (1) + Al(NO,), (aq) B) Al(OH), (s) + 3NO; (aq) → 3OH- (aq) + Al(NO,); (aq) C) Al(OH), (s) + 3NO,"(aq) → 30H- (aq) + Al(NO,), (s) D) Al(OH), (s) + 3H' (aq) → 3H,0 (1) + Al³* (aq) E) Al(OH), (s) + 3HNO, (aq) → 3H,0 (1) + Al* (aq) + NO, (aq) Answer: D 3) The balanced reaction between aqueous nitric acid and aqueous strontium hydroxide is Sr(NO3)2 (aq) + H2 (g) A) HNO3 (aq)…
Complete and balance the following redox reaction in basic solution 2- 3c₂²- 1 + 2 (s) H* CIO₂(g) →CIO₂ (aq) + CIO3(aq) 3 4 H₂O Reset ( (1) LO 5 OH- H 6 (g) H3O+ 7 8 CI • x H₂O 9 (aq) S
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.
For the gravimetric determination of manganese, 1.8762 g of sample containing Mn was dissolved in acid solution and made up to 100 mL in a calibrated volumetric flask. A 25.00 mL aliquot of this solution was transferred to a beaker. The solution was heated to boiling and chemical substances required were added till precipitating MnNH4PO4. After filtering, rinsing, and igniting, 0.5365 g of Mn2P2O7 was obtained. Calculate the % manganese in the sample (Mn: 55, P: 31, O: 16 g/mol).
The amount of sulfate in a solid sample was determined by first dissolving 562.2 mg of sample in water, and then precipitating the sulfate by the addition of 25.00 mL of 0.022 96 M BaCl2. The precipitate was filtered from the solution and the remaining Ba2+ was titrated with 16.52 mL of 0.014 57 M EDTA. What was the mass percent of sulfate in the solid?
In 'Synthesis of an Iron Complex Salt', hydrogen peroxide (H202) is added to the solution and heat is applied until boiling. A side reaction is the formation of rust brown precipitate, which consists of potassium permanganate (KMN04) ferrous ammonium sulfate, Fe(NH4)2(SO4)2-6H20] iron (III) hydroxide, Fe(OH)3 Iron (II) oxalate (FeC204)
7

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