Acids and Bases- Classical Properties of Acids and Bases

Classical Properties of Acids and Bases

The top photo shows a beaker labeled “H2O” with clear liquid and dark solid substances in the bottom of the beaker. A beaker labeled “H2SO4” contains liquid with foam. A beaker labeled “HOAC” contains cloudy liquid. A dissolving substance with white streaks appears in the last beaker with an identifying label. The bottom photo shows a beaker labeled “H2O” with cloudy gray liquid, a beaker labeled “H2SO4” with blue liquid, a beaker labeled “HOAC” with dark liquid, and a beaker labeled “HCl” with blue liquid.

Description: Classic examples of properties of acids. Acids change the color of litmus, react with metals and copper carbonate, and are no longer active when reacted with base.

Source: Shakhashiri, B.Z. Chemical Demonstrations: A Handbook for Teachers of Chemistry

Year: 1989   Vol: 3   Page: 58

Keywords: Litmus paper, Acid and Base properties, Neutralization, Disassociation

Rating:

Hazard: Medium

• Skin corrosion hazard
• Corrosive to metals
• Acute toxicity hazard – oral, inhalation
• Serious eye damage
• Aquatic toxicity hazard
• Oxidizing solids
• Solids which when wet produce flammable gases
• Specific organ toxicity – respiratory system

Effectiveness: Average

• Results are observable with guidance
• Mild effects are seen by audience
• Time to results is high
• Good connection from demo to course material
• Contrast between systems are noticeable

Difficulty: High

• Complex and extended lab equipment manipulation
• Use of toxic reagents
• Demo requires training or extended practice
• Multi-step procedures

Safety Precautions:

• Eye protection required
• Gloves required
• Absorbent materials on hand
• Sodium bicarbonate on hand
• Chemically resistant surface recommended
• Perform in a well-ventilated area
• ABC fire extinguisher on hand
• Prevent release of reagents to the environment

Class: Acids and Bases

Division: General

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