pls compute how to prepare the 3 solutions Prepare the following solutions by class:1. 500.0 mL 0.1000 M stock EDTA solutiona. Weigh an appropriate amount of Na:H:EDTA-2H:O (FW=372.24) to the nearest 0.1 mg and transferto a 400-mL beaker.b. Add about 200 mL distilled water. Stir to dissolve then add 1.0 g MgCl2-6HO crystals. Mix todissolve the crystals.NOTE: The dissolution of NazH:EDTA-2H:O may be slow so addition of NaOH pellets while stirringmay be added until the solution is clear. Heating the solution may also increase the dissolution ofNa:H:EDTA-2H:O.c. Quantitatively transfer the solution into a 500-mL volumetric flask. Rinse the beaker thrice withsmall portions of distilled water and transfer the rinse to the volumetric flask. Dilute to mark withdistilled 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" solutiona. 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 heatingthe solution in a hotplate. Do this until the CaCOs solids are completely dissolved or until no moreeffervescence is observed.NOTE: The stirring must be vigorous enough to dissolve the solids. It is advisable to swirl the beakerusing a crucible tong instead of using a stirring rod.c. Quantitatively transfer the solution into a 100-mL volumetric flask. Dilute to mark with distilledwater, 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 NH3NOTE: Refer to Appendix 3 for the preparation of buffer.

The procedure for preparation of first two solutions is written sufficiently, in the image itself.

Answered: 250.0 mL 1.0 M NH-NH pH 10 buffer…

Science

Chemistry

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

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

Chapter4: Types Of Chemical Reactions And Solution Stoichiometry

Section: Chapter Questions

Problem 47E

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Question

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.

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