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Unformatted text preview: re the solvent to be used in the spectrophotometric part of this experiment by
adding 6 mL of 3 M sulfuric acid to 75 mL of water.
2. Use a 50 mL buret to dispense a measured 35 ± 0.2 mL of this solvent into a clean 50
mL Erlenmeyer flask. Place this 50 mL flask to above the liquid level in a 250 mL
beaker containing an ice bath made roughly of equal parts of water and ice.
3. Accurately weigh ca. 200 ± 4 mg sample of the green chloro complex and transfer it
carefully to the flask of cooled, acidic solvent. Remove the flask from the cooling
bath, swirl it several times to insure that the solid has completely dissolved and the
solution is homogeneous, and then quickly fill another 50 mL buret (or a 25 mL
buret) with this cold solution. Return the flask containing the rest of the green
solution to the ice bath.
4. Dispense a measured 17.5 ± 0.2 mL portion of the cold green solution into another
clean Erlenmeyer flask and then quickly return the green solution remaining in the
buret to the still-cooling flask from which it originally came. At this point you should
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- Spring '07