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250.0 mL 1.0 M NH-NH pH 10 buffer solution from NH&Cl and NH3

250.0 mL 1.0 M NH-NH pH 10 buffer solution from NH&Cl and NH3

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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pls compute how to prepare the 3 solutions

Prepare the following solutions by class: 1. 500.0 mL 0.1000 M stock EDTA solution a. Weigh an appropriate amount of Na:H:EDTA-2H:O (FW=372.24) to the nearest 0.1 mg and transfer to a 400-mL beaker. b. Add about 200 mL distilled water. Stir to dissolve then add 1.0 g MgCl2-6HO crystals. Mix to dissolve the crystals. NOTE: The dissolution of NazH:EDTA-2H:O may be slow so addition of NaOH pellets while stirring may be added until the solution is clear. Heating the solution may also increase the dissolution of Na:H:EDTA-2H:O. c. Quantitatively transfer the solution into a 500-mL volumetric flask. Rinse the beaker thrice with small portions of distilled water and transfer the rinse to the volumetric flask. Dilute to mark with distilled water, cover and mix. d. Transfer to a clean and dry reagent bottle. Label as 0.1000 M stock EDTA solution. 2. 100.0 mL 0.0500 M stock Ca" solution a. Weigh appropriate amount of pure CaCO: (FW=100.09) to the nearest 0.1 mg into a 250 mL beaker. Add about 40.0 mL distilled water. Take note of the purity of CaCOs used. b. Carefully and slowly add concentrated HCl to dissolve the CaCOs solids while stirring and heating the solution in a hotplate. Do this until the CaCOs solids are completely dissolved or until no more effervescence is observed. NOTE: The stirring must be vigorous enough to dissolve the solids. It is advisable to swirl the beaker using a crucible tong instead of using a stirring rod. c. Quantitatively transfer the solution into a 100-mL volumetric flask. Dilute to mark with distilled water, cover and mix. d. Transfer to a clean, plastic (polyethylene) bottle. Label as 0.0500 M stock Ca²* solution. 3. 250.0 mL 1.0 M NH--NH pH 10 buffer solution from NH.Cl and NH3 NOTE: Refer to Appendix 3 for the preparation of buffer.
Transcribed Image Text:Prepare the following solutions by class: 1. 500.0 mL 0.1000 M stock EDTA solution a. Weigh an appropriate amount of Na:H:EDTA-2H:O (FW=372.24) to the nearest 0.1 mg and transfer to a 400-mL beaker. b. Add about 200 mL distilled water. Stir to dissolve then add 1.0 g MgCl2-6HO crystals. Mix to dissolve the crystals. NOTE: The dissolution of NazH:EDTA-2H:O may be slow so addition of NaOH pellets while stirring may be added until the solution is clear. Heating the solution may also increase the dissolution of Na:H:EDTA-2H:O. c. Quantitatively transfer the solution into a 500-mL volumetric flask. Rinse the beaker thrice with small portions of distilled water and transfer the rinse to the volumetric flask. Dilute to mark with distilled water, cover and mix. d. Transfer to a clean and dry reagent bottle. Label as 0.1000 M stock EDTA solution. 2. 100.0 mL 0.0500 M stock Ca" solution a. Weigh appropriate amount of pure CaCO: (FW=100.09) to the nearest 0.1 mg into a 250 mL beaker. Add about 40.0 mL distilled water. Take note of the purity of CaCOs used. b. Carefully and slowly add concentrated HCl to dissolve the CaCOs solids while stirring and heating the solution in a hotplate. Do this until the CaCOs solids are completely dissolved or until no more effervescence is observed. NOTE: The stirring must be vigorous enough to dissolve the solids. It is advisable to swirl the beaker using a crucible tong instead of using a stirring rod. c. Quantitatively transfer the solution into a 100-mL volumetric flask. Dilute to mark with distilled water, cover and mix. d. Transfer to a clean, plastic (polyethylene) bottle. Label as 0.0500 M stock Ca²* solution. 3. 250.0 mL 1.0 M NH--NH pH 10 buffer solution from NH.Cl and NH3 NOTE: Refer to Appendix 3 for the preparation of buffer.
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