Answer the following: I. Balance the following equations using the change in oxidation state method. a. NaNO3 + FeSsO4 + H2SO, Fe2(SO4)3 + NO + NazSO4 + H20 b. KMNO, + Na2C2O4 + H2SO4 MnSO, + CO2 + NazSO, + K2SO, + H20
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- (a) What is the percentage of MnO2 in a pyrolusite ore if a sample weighing 0.4000g is treated with 0.6000g of pure H2C2O4•2H2O and dilute H2SO4 and after reduction has taken place (MnO2 + H2C2O4 + 2H+→ Mn2++ 2CO2 + 2H2O), the excess oxalic acid requires 26.26ml of 0.1000N KMnO4 for titration? (b) If pure As2O3 were used instead of oxalic acid, how many grams would be required in order for the other numerical data to remain the same?(a) What is the percentage of MnO2 in a pyrolusite ore if a sample weighing 0.4000 g is treated with a 0.6000 g of pure H2C2O4.2H20 and dilute H2SO4 and after reduction has taken place (MnO2 + H2C2O4 + 2H+ Mn2+ + 2CO2 + 2H2O), the excess oxalic acid requires 26.26 mL of 0.1000 N KMNO4 for titration? (b) If pure As2O3 were used instead of oxalic acid, how many grams would be required in order for the other numerical data to remain the same?Calculate the time, in minutes, needed to plate 17.697 g of metal M at 43 Amps. The molar mass of metal M is 57.915 g/mol. M6+ + 6 e– → M Recall that, C = A*s, and Faraday’s constant, F, is 96,485 C/mole of electrons.
- A 1.000 g sample containing chlorides, iodides and inert materials was treated with dilute nitric acid followed by AgNO3. A precipitate of AgCl (143.32) and AgI (234.77) was produced and weighs 0.9238 g. On heating in a current of Cl2, the AgI is converted to AgCl, and the resulting product weighs 0.7238 g. Find the percentage of a) NaI (149.89) and b) NaCl (58.44) in the sampleDescribe how you would prepare 1litre of 150ppm Cu2+ using Cu metalIn which of the below reactions is metal sulfide dissolution more energetically favorable? MnS + H+ <--> Mn2+ + HS- CuS + H+ <-->Cu2+ + HS-
- 35.A sample of pyrolusite weighs 0.5000 g. To this is added 0.6674 g of As2O3 and dilute acid. After solvent action has ceased, the excess three-valent arsenic is titrated with 45.00 mL of 0.1000 N KMnO4. Calculate the oxidizing power of the pyrolusite in terms of percemtage MnO2. 36. A solution of Iodinebia such concentration that 20.0 mL are required to titrate the antimony in a 0.100 g sample containing 84.93% Sb2S3(339.7 g/mol). What is the value of 1.00 mL of this Iodine in terms of grams sulfue in tiration?A concentration cell was made using a silver metal electrode in a saturated solution of AgCl for the anode half cell, and a silver metal electrode in 1.00 M Ag⁺ for the cathode half cell. E for the cell was 0.288 V at 25°C. Calculate the Ksp for AgCl. (Note: For purposes of this exercise, carry out the calculation to three significant figures.)A sample of pyrolusite weighing 0.6000 g is dissolved in a solution containing 5.00 mL of 6.00 N H2SO4 and 0.900 g of H2C2O4 .2H2O. The excess oxalate then requires 24.00 mL of KMnO4 solution for titration. If each mL of the KMnO4 will oxidize the Fe(II) in 0.03058 g FeSO4 .7H2O, what is the oxidizing power of the sample in terms of MnO2?
- In order to draw Pourbaix Diagram for a metal, all possible electrochemical and chemical reactions have to be known and with the application of Nernst equation or solubility product constant, the E-pH diagram can be constructed. We have looked at the diagram for Fe. While the Pourbaix diagram of Fe is quite complex due to its two oxidation states +2 and +3, construct a simplified Pourbaix diagram for Fe considering only the following three reactions. Note: CFe+2 and CFe+3 can be taken as 10-6 M Fe ----- Fe+2 + 2e- 2Fe+2 + 3H2O ----- Fe2O3 + 6H+ + 2e- 2Fe+3 + 3H2O ----- Fe2O3 + 6H+A sample of pyrolusite weighing 0.6000 g is dissolved in a solution containing 5.00mL of 6.00 N H2SO4 and 0.900 g of H2C2O4.2H2O. The excess oxalate then requires24.00 mL of KMnO4 solution for titration. If each mL of the KMnO4 will oxidize the Fe(II)in 0.03058 g FeSO4.7H2O, what is the oxidizing power of the sample in terms of MnO2?84.33%9 The pyrite (iron sulfide) roasting process is carried out following the next reaction [FeS2 (s) + O2 (g)]25°C → [Fe2O3 (s) + SO2(g)] 900 °C a) Determine the enthalpy balance for the reaction as stated in the reaction shown b) Determine the enthalpy balance using air with 10% excess and preheated to 500°C