Thermochemistry- Reactions of Metals and Hydrochloric Acid

Description: Samples of different metals (Fe, Zn, Mg) are immersed in conc HCL. The temperature rise is measured and observed to be different in each case; gas evolution is observed.

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

Year: 1983 Vol: 1 Page: 25

Keywords: Iron, Exothermic, Hydrochloric acid, Zinc

Rating:

Hazard: Medium

Skin corrosion hazard
Flammability hazard
Acute toxicity hazard
Inhalation hazard
Respiratory hazard
Aquatic toxicity hazard
Serious eye damage hazard
Electric shock hazard
Corrosive to metals

Effectiveness: Good

Observations are perceivable with guidance
Secondary observations
Good connection from demo to course material
Mild effects are seen by audience
Time to results is medium
High reliability

Difficulty: Medium

Some intermediate steps to results
Some sequential manipulations
Production of flammable gases
Production of toxic gases
Demonstrations in which displays are used

Safety Precautions:

Eye protection required
Gloves required
Lab coat recommended
Perform in a well-ventilated area
Use of chemically resistant surface
Absorbent material on hand
Avoid exposures to gas, mists, or vapors
Avoid open flame
ABC fire extinguisher on hand
Sodium bicarbonate on hand
Prevent release of reagents to the environment

Class: Thermochemistry, Transition Metal Chemistry,

Division: General, Inorganic Chemistry

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