Chemicals:
1. Standard zinc solution (10.0 mg
L-1 Zn2+)
0.0440 grams ZnSO4 • 7H2O per
liter, volumetric
2. Zincon dye (100mg L-1)
0{2[a(2-hydroxy-5-sulfophenylazo)benzilidene]-hydrazino}
benzoic acid, sodium salt (80%)
0.125 grams zincon per liter pH 9
buffer, volumetric
Use the H3BO3/KCl/NaOH
pH 9 buffer from Chapter 18
3. Zinc unknown
Can
use any dilution of #1 that the students have in their calibration (A.3), eg.,
9H2O: 1 Zn2+,
8H2O: 2Zn2+, etc.
4. pH 9 buffer
H3BO3/KCl/NaOH
buffer (Chapter 18)
5. Zinc tablet unknown
See Secton B. 6 of Chemtrek
6. Section C. 1
A choice of solutions:
Tea
Juice from Tofu
Apple juice
Phytic acid, dodecasodium salt
0.02 g per 100 mL
Lemon juice
7. Solid foods:
Tofu, soybeans, peas, corn
Other
choices could include: fruits, spinach,
grapes, other legumes, coffee beans, etc.
Supplies:
1. Cotton swabs
2. Super jumbo straws
3. Slim straws
4. Thin-stem pipets
5. Labeled, filled microburets
of each of the solutions from 6 above.
Set 1 tray each at reagent
central.
6. Multimeters
7. CdS photocell
8. Filter paper circles
Whatman #41
Per Student:
1 - Large drop microburet
1 SepCapTM cap with hole
1 - Slim straw
1 - Microstirrer
1 - Microburet
2 - Wire leads with alligator clips
1 - Wash bottle
From Student Kit:
3 - 1 x 12 well microstrips
1 - 24-well tray
1 - 96-well tray, round bottom
Scissors
Office
punch
Lab
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