19. Which of the equation below is (arc) appropriate for the laboratory preparation of the Hydrogen halide indicated? NaCla + H2S0,(conc.)- NaliSO,(aq) + HCIe) NaCls + H,PO,(conc.)- NaH, PO,(a) + HCle) 2. Nalsy + H,SO,(aq)(conc) NaHSO(ag) + Hl)
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Answer Q19, 20, 21
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- Write a balanced net-ionic equations to describe a. reduction of Fe3+ to fe2+ by SO2b. reaction of H2MoO4 in a Jones reductorc. oxidation of HNO2 by a solution of MnO4-d. reaction of aniline (C6H4NH2) with a mixture of KBrO3 and KBr in acidic solutione. air oxidation of HAsO3(2-) to HAsO4(2-)f. reaction of KI with HNO2 in acidic solution1. 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?What wt. of impure calcite (CaCO3) should be taken for analysis so that no. of milliliters of CO2 obtained by treating with acid, and measured dry at 18°C and 763 mm pressure, will equal the percentage of CaO in the sample?
- Consider the reaction between dissolved Fe2+ and elemental sulfur (S0) to form hematite (Fe2O3) and sulfide a) Identify the oxidant and reductant in this reaction, determine half-reactions, and balance thereaction. b) Is this reaction thermodynamically favorable? c) Would you expect HS- to react readily with Fe2O3 (i.e. the reverse of the reaction)?if we use KMnO4 and H3Po4 and MnSO4 for tritation of fecl3 and calculation of. Fe2+ what suitable ratio for tritationCaustic potash that has been exposed to air is found on analysis to contain 90.00% KOH, 2.38% K2CO3 and 7.62% H2O. What weight of residue will be obtained if 1.00 g of this sample is added to 46.00 mL of 1.00 N HCl and the resulting solution, after neutralization with 1.070N KOH is evaporated to dryness?
- 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 sampleGive the summary of reaction and rationalization of each samples.A solution that may contain Cu2+ , Bi2+ , Sn4+ , or Sb2+ is treated with thioacetamide in an acidic medium. The black precipitate which forms is partly soluble in strongly basic solution. The precipitate which remains is soluble in 6 M HNO3 and gives only a white precipitate upon the addition of NH4OH. The basic solution, when acidified, produces an orange precipitate. Which group II ions are present? Which are absent? Which are in doubt? How would you remove all doubt?
- For problem 2, I have to assign oxidation states for transition metals by drawing the lewis structure with all the sigma bonds, rmeoving all the ligands on their closed shell configuration and noting the formal charge, and accounting for all the ligand charges, where oxidation number = molecular charge - sum of ligand charges.I am unsure how to identify Lewis acids. How to solve Problem 7?Silver is obtained in much of the same manner as gold using NACN solution and O2. Describe with appropriate equation the extraction of Ag from Argentite Ag2S. The products are SO2 and Af(CN) -2 which are reduced with ZnSuggest a method by which Ni2+ can be precipitated homogeneously as NiS. a. Add sodium sulfste to the solution to precipitate NiSO4. Heat the nickel(II) sulfate to liberate O2 and yield pure NiS. b. The slow hydrolysis of thioacetamide can be used to generate a source of hydrogen sulfide gas, which provides the S²- to complex with the Ni2+. c. Add thiosulfuric acid to the solution to react with Ni2+ and precipitate NiS. d. Heat S8 in the presence of Ni2+, in an inert atmosphere, to produce NiS.