Equation writing. balance the following redox reactions using change in oxidation state method (Valence-change method) and determine the reducing and oxidizing agent KMnO4 + KCl + H2SO4 -> MnSO4 + Cl2 + K2SO4 + H2O
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Equation writing.
KMnO4 + KCl + H2SO4 -> MnSO4 + Cl2 + K2SO4 + H2O
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- 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. 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?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?
- 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.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?Complete and balance, using the half reaction method in acidic solution, the equation for thereaction of oxalate with permanganate C2O42- + MnO4 --> CO2 + Mn2+
- (c)Ions that react with Ag+ like SCN- can be determined electrogravimetricallyby deposition on a silver working anode:Ag(s) + SCN- ≤ AgSCN(s) + eA silver anode with initial mass of 12.4730 g was used to electrolyse 85.00 mL of asolution of 0.0245 M KSCN. At the end of the experiment, the anode weighed12.5767 g. How long did the experiment take, if a current of 100 mA was used?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%A mixture of copper and gold metals that is subjected toelectrorefining contains tellurium as an impurity. The standardreduction potential between tellurium and its lowestcommon oxidation state, Te4+, isTe4+(aq) + 4 e------->Te(s) E°red = 0.57 VGiven this information, describe the probable fate of telluriumimpurities during electrorefining. Do the impuritiesfall to the bottom of the refining bath, unchanged, as copperis oxidized, or do they go into solution as ions? If theygo into solution, do they plate out on the cathode?
- (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 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 the reaction between Cu(s)and connected H2SO4 the reaction mixture also has to be heated.Refer to the Table Standard Reduction Potentials and the chemical equilibrium to explain why warm ,concentrated acid is necessary to oxidise Cu
