Acid/Base Wand
Description: A long glass tube is filled almost full of Universal Indicator solution. A few drops of 0.02M HCl is added to one end and stopper, and a few drops of 0.02M NaOH is added to the other end. The tube is inverted a few times to see all universal indicator colors.
Source: Chem 13 News#190; December
Year: 1989 Vol: 21 Page: 12
Keywords: Acids and Bases, HCl, NaOH, Indicators
Rating: 
Hazard: Some
- Corrosive to metals
- Skin corrosion hazard
- Serious eye damage
- Acute aquatic toxicity
- Inhalation hazard
- Spill hazard
Effectiveness: Average
- Some connection to course material
- Results are observable with guidance
- Time to results is low
- Mild effects are seen by audience
- Secondary observations
Difficulty: Medium
- Intermediate steps to results
- Some careful manipulations required
- Volume-dependent additions to reagents
- Use of mildly reactive substance
Safety Precautions:
- Eye protection required
- Gloves required
- Avoid exposure to vapors, mists, or droplets
- Absorbent materials on hand
- Sodium bicarbonate on hand
- Prevent release of reagents to the environment
Class: Acids and Bases, Indicators, Neutralization
Division: General
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