How do you prepare 250 ml 0.05 M CuCl2 solution from 0.1 M CuCl2 stock solution? Lütfen birini seçin: a. By mixing 125 ml 0.1 M stock solution with 125 ml water b. By transferring 125 ml 0.1 M stock solution to 250 ml volumetric flask and making up the mark with water c. By transferring 125 ml 0.1 M stock solution 500 ml volumetric flask and making up the mark with water d. By transferring 250 ml 0.1 M stock solution to 1000 ml volumetric flask and making up the mark with water

How do you prepare 250 ml 0.05 M CuCl2 solution from 0.1 M CuCl2 stock solution? Lütfen birini seçin: a. By mixing 125 ml 0.1 M stock solution with 125 ml water b. By transferring 125 ml 0.1 M stock solution to 250 ml volumetric flask and making up the mark with water c. By transferring 125 ml 0.1 M stock solution 500 ml volumetric flask and making up the mark with water d. By transferring 250 ml 0.1 M stock solution to 1000 ml volumetric flask and making up the mark with water

Introductory Chemistry For Today

8th Edition

ISBN:9781285644561

Author:Seager

Publisher:Seager

Chapter7: Solutions And Colloids

Section: Chapter Questions

Problem 7.107E

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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?
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As part of this experiment you will need to determine the concentrations of Fe* and SCN ions present in test tubes 1-9. These values can be calculated using the volumes and concentrations provided in Tables 1 and 2 of the Equilibrium Lab - Procedure and the dilution equation (M,V1 = M2V2). Note: the solutions provided in the lab, and therefore the tables in the lab document, are the compounds used to prepare the solution. You must determine the concentration of the ions based on how these compounds díssociate in solution Complete the following table by filling the the calculated initial concentrations of each substance. Be sure to: Pay attention to significant figures • Round appropriately Use decimal notation (not scientific) Do not include units Test Initial [Fe3*] (M) Initial [SCN'] (M) Tube 1 3 4. 6. 7 8. 2.
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