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- Nickel(II) formate [Ni(HCO2)2] is widely used as a catalyst precursor and to make metallic nickel. It can be prepared in the general chemistry laboratory by treating nickel(II) acetate with formic acid (HCO2H). Ni(CH3CO2)2(aq) + 2 HCO2H(aq) Ni(HCO2)2(aq) + 2 CH3CO2H(aq) Green crystalline Ni(HCO2)2 is precipitated after adding ethanol to the solution. (a) What is the theoretical yield of nickel(II) formate from 0.500 g of nickel(II) acetate and excess formic acid? (b) Is nickel(II) formate paramagnetic or diamagnetic? If it is paramagnetic, how many unpaired electrons would you expect? (c) If nickel(II) formate is heated to 300 C in the absence of air for 30 minutes, the salt decomposes to form pure nickel powder. What mass of nickel powder should be produced by heating 253 mg of nickel(II) formate? Are nickel atoms paramagnetic?UEid- base tit ration the Consentrat ion of ammonia Solution excess HCL was titrated ith o.07om Na, cO3 Solutian. The volume of Na, Coz Solution reguired was 15.50 ml using the following eguations: 2HCLem> + Na, COgcaps CO2 Cays + HzO1) t NaCL Calculate the concentration (molarity and ppm) of ammonia in the Original Solution.(MM of NHzis 17.031.9/4) 10.0 was by of o.10OMI HCE to ThenAcid-Base titration: Standardization of 0.1 M NAOH Trial 1 Mass KHP used, g 0.297 g Final reading Volume NaOH, mL 15.59 mL Initial reading Volume NaOH, mL 0.23 mL Volume NaOH consumed, mL 15.36 mL Moles KHP used Moles NaOH used Molarity of NaOH solution
- 1. Molarity of the NaOH solution 0.238 mol/L Trial 1 Trial 2 Trial 2. Volume of H;PO4 added to flask 22.0 mL 22.0 mL 22.0 mL 3. Initial NaOH volume _0.25_ mL _0.75_ mL 0.55 mL 4. Final NaOH volume 17.60_ mL 18.20_ mL _17.90_ mL 5. NAOH volume used for titration to reach green end point mL mL mL 6. NaOH volume used for titration 7. Moles of NaOH used for titration mol mel mel 8. Moles of H;PO4 that reacted mol mel mol 9. Volume of H;PO4 added to flask L 10. Molarity of H3PO4 mol/L mol/L mol/Lcontaining Single unkown Solution CA is added to 3 test tubes Calion following added and The anions Were Observation were recorded.identify the Cation that Would pro duce these o bservadic test tube Anion addet Ob servation So 2- Precipiate 2. S 2- precipitate 3. precipitateEqual volumes of a 5.28 x 10-4 M nickel (II) nitrate solution and a 3.18 x 10-³ M sodium carbonate solution are mixed. The Ksp of nickel (II) carbonate is 1.42 x 10-7. Qsp = 4.20 x 10-7. A precipitate will not form Qsp = 1.68 x 10-6. A precipitate will form Qsp = 4.20 x 10-7. A precipitate will form Qsp = 1.68 x 10-6. A precipitate will not form Qsp cannot be calculated without knowing the specific volumes of the two solutions that were mixed
- AaBbCcDd AaBbCcDd AaBbC AaBbCcD AdD AaBb- 1 Normal 1 No Spac... Heading 1 Heading 2 Title Subti 田,、 即咖山 Paragraph Styles 1. 3. 2.15.0 mL HNO3 was titrated to equivalence with 60.0 mL of 0.020 NaOH. What is the concentration of the acid? 近0 of F5 F7 6日 てい いレゴA solution of HCl was titrated against sodium carbonate. What is the titer for Trial 1 in the given data? T2 0.3562 0.3479 0.3042 Weight (g) Initial V (ml) 0.80 1.60 35.20 36.70 39.80 Final V (ml) Vol HCI used (ml) 35.10 N of HC (eq/L) 0.1954 0.1870 Average N of HCl (eq/L) AIf 2 ml of 25 N H2SO4 is transferred to 50 ml volumetric flask and complete to mark with ditilled water, the concentration of acid will be .. M* O 2.5 O 1.5 2 O 0.5 0 1 Non of these
- Exp. 4 Volhard method In an experiment of determination of KBr (g%) by volhard method In a flask; 15ml KBr was taken 25 ml 0.05M AgNO3 1 ml nitric acid 1 ml ferric alum indicator Then titration with 0.05M KSCN was done The end point was =15 ml Calculate the mass of KBr in g%Compare the solubility of lead chromate in each of the following aqueous solutions: Clear All 0.10 M Pb(NO3)2 More soluble than in pure water. 0.10 M (NH4)2Cro4 Similar solubility as in pure water. 0.10 M NaNO3 Less soluble than in pure water. 0.10 M NHẠCH3CO0 Submit Answer Retry Entire Group 9 more group attempts remaining10. A 0.514 gram sample of NazCO, (106.0 g/mol) was dissolved in distilled water in a 100.0 mi volumetric flask. The molar concentration of Na,CO, in solution is: 0.0485 M 0.0370 M b. 0.4849 M 0.0340 M 0.0330 M d. е.