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- Why must the charge balance in oxidation-reduction reactions?Which of the oxidizing agent listed is (are) capable of oxidizing Br - (aq) to BrO 3 - (aq) in acidicsolutions). Please answer with explanations. Thanks(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?
- calculate the potential of platinum elctrode emersed in a solution 0.0613 M in k4Fe(CN)6 and 0.00669M in k3Fe(CN)6Many 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 youranswerThe electrochemical cell: SCE||H+(a=x)|glass electrodehas a potential of 0.2094 V when the solution in the right-hand compartment is abuffer of pH 4.006. The potential reading for an unknown solution measured by thesame glass electrode was –0.3011 V. Calculate the pH and the hydrogen ion activityof the unknown solution. Assume a Nernstian response for the glass electrode.
- Manganese silicide has the empirical formula MnSi andmelts at 1280 °C. It is insoluble in water but does dissolvein aqueous HF. (a) What type of compound do you expectMnSi to be: metallic, molecular, covalent-network, orionic? (b) Write a likely balanced chemical equation for thereaction of MnSi with concentrated aqueous HF.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 sampleMany 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?
- 1. A Cr3+ solution is electrolyzed using a current of0.365 A. What mass of Cr(s) (51.9661) is plated outafter 10 hours?2. When an aqueous solution of CuSO4 is electrolyzedcopper metal is deposited. If a constant current waspassed for 5.00 h and 404 mg of Cu (63.546) metal wasdeposited, what was the current?Balance the following reaction under acidic conditions and calculate cell potential at 298K Cr2O72- + I- (aq) -> Cr3+(aq) + I2(s) Cr2O72- = 3.0M, H+= 1.0M , I-= 1.00, Cr3+= 2.0x 10-5Iron corrodes to produce rust, Fe2O3, but other corrosionproducts that can form are Fe(O)(OH), iron oxyhydroxide,and magnetite, Fe3O4. (a) What is the oxidation numberof Fe in iron oxyhydroxide, assuming oxygen’s oxidationnumber is -2? (b) The oxidation number for Fe in magnetitewas controversial for a long time. If we assume thatoxygen’s oxidation number is - 2, and Fe has a uniqueoxidation number, what is the oxidation number for Fein magnetite? (c) It turns out that there are two differentkinds of Fe in magnetite that have different oxidationnumbers. Suggest what these oxidation numbers are andwhat their relative stoichiometry must be, assuming oxygen’soxidation number is -2.