Acids and Bases- Acid/Base Wand

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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