Chemistry/Factors Affect Equilibrium Prep
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Equipment and reagents for: 2 classes of 24 students (12 groups/class)
Apparatus:
- 12—18 x 150 mm test tubes
- 12—25 x 200 mm test tubes
- 12—250 mL beakers
- 1—fritted glass gas bubbler (for CO2)
- 12—60 mL syringes, fitted with 8 cm length of rubber tubing on end
- 36—100 mL beakers
- 36—13 x 100 mm test tubes
- several centrifuges
- 12—stirring rods
- numerous weighing boats
- 12—stoppers to fit 25 x 200 mm test tubes
- 12—stoppers to fit 18 x 150 mm test tubes
| Reagent | Preparation | Put Into |
|---|---|---|
| Distilled water | boil 2 L of distilled water for each class to ensure the pH is close to 7 | 6 bottles |
| Bromothymol blue | 12 droppers | |
| pH 7 Buffer | 12 droppers | |
| 0.1 M NaOH | 2.00 g sodium hydroxide diluted to 500 mL | 12 droppers |
| 0.1 M HCl | 4.3 mL concentrated hydrochloric acid diluted to 500 mL | 12 droppers |
| Universal indicator | 12 droppers | |
| tank of carbon dioxide or CO2 generator | ||
| 0.25 M CuSO4 | 31.2 g cupric sulphate diluted to 500 mL | 12 bottles |
| solid NH4Br | 50 g | one beaker |
| (NH4)2SO4 | 40 g | one beaker |
| CoCl2•6H2O | 10 g | one beaker |
| 1–butanol | 120 mL | 6 droppers |
| NH4Cl | 40 g | one beaker |
| concentrated HCl | 50 mL | 6 droppers |
| 0.1 M AgNO3 | 1.70 g of AgNO3 diluted to 100 mL | 6 droppers |
| 0.1 M NaCl | 0.585 g NaCl diluted to 100 mL | 6 droppers |
| 0.1 M K2CrO4 | 1.94 g potassium chromate diluted to 100 mL | 6 droppers |
