Syn. Rutile /UGS Chlorination Purification Electrolysis Chlorination: ____. + 2C+ Electrolysis: MgCl₂ → Mg reduction in Ar: ‒‒‒- Coke ---.. → Ti + MgCh ---- TICI Mg Reduction Vacuum Distillation Cutting Crushing Ti Sponge
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- In Fehling's reaction heat is ?a)Reducerb) Catalyserc)Substrate explain the answerIn the video "Sacrificial Anode Materials Demo", which among Zn, Al, Mg served as as i) sacrificial anodes? and ii) as noble coatings?TRUE OR FALSE. 1The color of permanganate solution renders impossible accurate readings at the lower meniscus.2Permanganate-oxalate reactions are run at reduced temperatures.3The permanganate method is always carried out in a highly acidic medium.4Sulfuric acid in permanganate titration prevents the formation of reduction products.5REDOX reaction involves the sharing of electron/s from one species to another.
- 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?
- Many applications of electrochemistry have been in chemical analysis.Suppose a Fe|Fe2+ concentration cell is set-up in which the [Fe2+] = 1.0 x10¯2 M in one compartment but the concentration in the othercompartment is unknown. The Ecell was measured at 0.024V when thehalf-cells were connected.(i) Without doing a numerical calculation, is the unknown more orless concentrated than the 1.0 x 10¯2 M solution? Justify youranswerMany applications of electrochemistry have been in chemical analysis.Suppose a Fe|Fe2+ concentration cell is set-up in which the [Fe2+] = 1.0 x10¯2 M in one compartment but the concentration in the othercompartment is unknown. The Ecell was measured at 0.024V when thehalf-cells were connected.(i) Without doing a numerical calculation, is the unknown more orless concentrated than the 1.0 x 10¯2 M solution? Justify youranswer(ii) Calculate the unknown concentration.(iii) Does your calculated answer agree with your original answer?Why?(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?
- What is chemical reduction (only reduction, not redox) and chemical dechlorination in chemical treatment of hazardous waste? What are their processes?A 100 ml sample of pond water was analyzed using Winkler method to determine its oxygen demand. It took 32.4 ml of 0.0100 M Na2S2O3 to react with Iodine. Calculate the oxygen for this pond water.Addition of both Bi3+ and Sn2+ by the method by studying the cathode potential to be made for molding of those in a buffered solution to 0.100 M and pH 1.5. Find the concentration of the more difficult-to-make species or the more easily-reducible species. Sn2+ + 2 e- ↔ Sn (k) E0 = - 0.136 V BiO+ + 2 H+ + 3 e- ↔ Bi (k) E0 = 0.320 V A. 3.2x10-2MB. 2.33 x 10-22MC. 1x10-6MD. 6.2x10-22M
