Pls compute how to prepare the following solutions: 1. 500.0 mL 0.1000 M stock EDTA solution a. Weigh an appropriate amount of Na2H2EDTA2H2O (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 MgCl26H2O crystals. Mix to dissolve the crystals. NOTE: The dissolution of Na2H2EDTA∙2H2O 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 Na2H2EDTA∙2H2O. 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. 25.0 mL 4.0 M MnSO4 from MnSO4·2H2O crystals a. Weigh the needed amount of crystals in a beaker and dissolve in about 10 mL distilled water. b. Filter the solution into a 25-mL volumetric flask and dilute to mark. 3. 25.0 mL 18 M NaOH solution with 5 g KI and 0.15 g NaN3 a. Dissolve the solids in a beaker using approximately 10 mL distilled water while stirring in a hotplate. b. Transfer the solution in a 25-mL volumetric flask and dilute to mark. NOTE: Preparation should be done in a water bath, under the fume hood.
Pls compute how to prepare the following solutions:
1. 500.0 mL 0.1000 M stock EDTA solution
a. Weigh an appropriate amount of Na2H2EDTA2H2O (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 MgCl26H2O crystals. Mix to
dissolve the crystals.
NOTE: The dissolution of Na2H2EDTA∙2H2O 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
Na2H2EDTA∙2H2O.
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. 25.0 mL 4.0 M MnSO4 from MnSO4·2H2O crystals
a. Weigh the needed amount of crystals in a beaker and dissolve in about 10 mL distilled water.
b. Filter the solution into a 25-mL volumetric flask and dilute to mark.
3. 25.0 mL 18 M NaOH solution with 5 g KI and 0.15 g NaN3
a. Dissolve the solids in a beaker using approximately 10 mL distilled water while stirring in a hotplate.
b. Transfer the solution in a 25-mL volumetric flask and dilute to mark.
NOTE: Preparation should be done in a water bath, under the fume hood.
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