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- When jump-starting a car with a dead battery, the ground jumper should be attached to a remote part of the engine block. Why?The Ostwald process for the commercial production of nitric acid involves the following three steps: 4NH3(g)+5O2(g)4NO(g)+6H2O(g) 2NO(g)+O2(g)2NO2(g) 3NO2(g)+H2O(l)2HNO3,(aq)+NO(g) a. Which reactions in the Ostwald process are oxidationreduction reactions? b. Identify each oxidizing agent and reducing agent.A sample of impure KI weighing 0.600 g is dissolved in water, the solution acidified, and 25.00 mL of 0.0400 M KIO3 (an excess ) is added. The iodate is reduced to I2 and the iodide is oxidized to I, The I2 is boiled off, the solution cooled, and an excess of pure KI is added to react with the unused KIO3. The I2 produced is titrated with 40.38 mL of 0.1053 N thiosulfate. Write the equations for the reactions which occurred and calculate the percentage of KI in the sample.
- A sample of impure tin of mass 0.535 g is dissolved in strong acidto give a solution of Sn2+. The solution is then titrated with a0.0448 M solution of NO3-, which is reduced to NO(g). Theequivalence point is reached upon the addition of 0.0344 L of theNO3- solution. Find the percent by mass of tin in the originalsample, assuming that it contains no other reducing agents.Sample: Saline 0.900% (m/v), in sodium chloride (NaCl). Data: M.A. (g/mol): Na = 22.9898; K = 39.0983; Cr=51.9961; Ag = 107.8682; Cl = 35.453; N=14.0067; O = 15.9994. Material available in the laboratory's warehouse: Reagents: distilled water; standardized solution of silver nitrate (AgNO₃), at a concentration of 0.09980 mols/L; Potassium chromate solution (K₂CrO₄) 1%; ammoniacal ferric alum solution [Fe(NH₄)(SO₄)₂] and; nitrobenzene (or cooking oil, alternatively); 0.1000 mols/L potassium thiocyanate (KSCN) standard solution. Glassware: beakers of all sizes available on the market; 50, 100, 150, 200 and 250 ml Erlenmeyers; 10.00 and 25.00 mL volumetric pipettes; 15.00 mL burette; 30.00, 50.00 and 100.00 mL volumetric flasks Calculate the molarity of saline, in terms of the NaCl concentration (concentration in mols/L). (a) 0.900 mols/L (b) 5.84 mols/L (c) 0.154 mols/L (d) 0.0154 mols/LConsider the following reaction: H3AsO4 + Sn2+ + 2 H+ --> H3AsO3 + Sn4+ + H2O a. What is the oxidation state of H in every place it appears? b. What is the oxidation state of As in H3AsO3? c. Is Sn being oxidized or reduced here? Explain. d. What is the reducing agent here?
- A 5.00 mL sample of brandy was diluted to 1.00 L in a volumetricflask. The ethanol in 25.00 mL aliquot of the diluted solution wasdistilled into 50.0 mL of 0.02000 M K2Cr2O7and oxidized to aceticacid with heating.3C2H5OH + 2Cr2O72- + 16 H+ → 4 Cr3+ + 3CH3COOH + 11 H2OAfter cooling, 20.00 mL of 0.1253 M Fe3+ was pipetted into the flask. The excess Fe2+ was then titrated with 7.46 mL of standard K2Cr2O7to a diphenylamine sulfonic acid endpoint. Calculate the percent (w/v) ethanol (MW 46.07 g/mol) in the brandy.IWrite balanced equations for the following reactions in basic solution: SO2 + I2 resulting in SO2 + SO3 +1 to the -1 Zn + NO3 to the -1 resulting in NH3 +Zn to the +2 ClO to the -1 + 4CrO2 Write balanced equations for the following reactions in acid solution: Ni to the +2 + IO4 to the -1 resulting in Ni to the =3 + 1 to the -1 O2 + Br to the -1 resulting in H2O + Br2(I) Ca + Br to the 1 resulting in H2O (I) + Br2 (I) Ca + Cr2O7 to the -2 resulting in Ca to the +2 + Cr to the +2What is the oxidation state for [(SALEN)VCl2?
- Pure copper may be produced by the reaction of copper(I) sulfide withexcess oxygen gas as follows:Cu2S(s) + O2(g) ---> 2Cu(s) + SO2(g)What mass of copper(I) sulfide is required in order to prepare 0.610 kg ofcopper metal?A. 0.610 kgB. 0.764 kgC. 0.305 kgD. 0.459Subterranean brines in parts of the United States are rich iniodides and bromides and serve as an industrial source of theseelements. In one recovery method, the brines are evaporated todryness and then melted and electrolyzed. Which halogen ismore likely to form from this treatment? Why?Determine the oxidation state of the following: 1. O22. Cr in K2Cr2O73. S in MgSO44. P in Zn3(PO4)25. Group VIA elements