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Unformatted text preview: converted to the aquo complex. Keep these two
grayish-pink standards in an ice bath so that further conversion from chloro to aquo is
7. Adjust the temperature of a 250 mL beaker containing 150 mL water to within at least
2C of 55C. Take two test tubes of the essentially pure green chloro complex--one
from the 0.05 M set, and one from the 0.01 M set (i.e. Test Tube #2 and 5). Place the
two tubes into the beaker of hot water, noting the time to the nearest second. At the
beginning, agitate the two test tubes in the hot water bath so that temperature
equilibrium is rapidly attained (be careful not to break the thermometer). Maintain
the bath temperature constant to ±0.5° by adjustment of the hot plate or, if necessary,
by addition of small amounts of cold water. Record the exact temperature of the bath.
Record the times at which the color of each solution matches the grayish-pink color
of the corresponding half-reacted solution (i.e. Tubes #1 and 4). For best comparison,
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- Spring '07