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- (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?In the video "Sacrificial Anode Materials Demo", which among Zn, Al, Mg served as as i) sacrificial anodes? and ii) as noble coatings?Cathodic protection can be achieved by attaching a more (anodic / cathodic) material to the one to be protected.
- The E°cell = 0.135 V for the reaction3I2(s) + 5Cr2O72-(aq) + 34H+(aq) → 6IO3-(aq) + 10Cr3+(aq) + 17H2OWhat is Ecell if [Cr2O72-] = 0.014 M, [H+] = 0.21 M, [IO3-] = 0.00018 M, and [Cr3+] = 0.0039 M?Ecell =For the reaction, 2CuI(s) + Cd(s)--->Cd2+ + 2I-(aq) + 2Cu(s), E0=0.23V. Given that E0Cd2+/Cd=-0.403V, determine E0 for the half reaction.At 25 ∘C,25 ∘C, a titration of 15.00 mL of a 0.0320 M AgNO3 solution with a 0.0160 M NaI solution is conducted within the cell SCE || titration solution | Ag(s)SCE || titration solution | Ag(s) For the cell as written, what is the potential after the addition of each volume of NaINaI solution? The reduction potential for the saturated calomel electrode is ?=0.241 V. The standard reduction potential for the reaction Ag++e−⟶Ag(s) is ?∘=0.79993 V The solubility constant of AgI is ?sp=8.3×10^−17. 0.200 mL?= 19.00 mL?= 30.00 mL?= 43.20 mL?= please solve
- the fpllowing cell was used fordetermination of pCrO4: SCE||CrO4^2-(xM),Ag2CrO4(sat'd)|Hg calculate the pCrO4 IF THE POTENTIAL is -0.313V.The _____ in a _____ voltammogram is related to the ____ a. limiting current, cyclic, concentration of the analyte of interest b. limiting current , linear sweep, concentration of the analyte of interest c. peak current cyclic, standard reduction potential of the analyte of interest d. peak current , linear sweep, standard reduction potential of the analyte of interest e. none of theseFor 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 pH of a 0.01M HNO3 solution taking into account activity.
