Acid and Bases- Leeching Lead Into Acidic Solution

Balloon Races- Ionization of Hydrochloric Acid and Acetic Acid

Coin-Operated Red, White, and Blue Fountain: Reaction of Nitric Acid and Copper

Combustion Products of Sulfur

Conductivity and Extent of Dissociation of Acids and Bases

Fizzing Races: Ionization of HCl and Acetic Acid

Multiple Ammonia Fountain

Acid + Base -> Neutral

Acid-Base Indicators Extracted from Plants

Acid/Base Wand

Acidic and Basic Properties of Oxides

Acidic and Basic Properties of Salts

Acidity of Aluminum Chloride in Solution

Amphoteric Properties of Aluminum Hydroxide

Classical Properties of Acids and Bases

Colorful Acid-Base Indicators

Food is Acidic: Cleansers are Basic

Nitric Acid Acts on Copper

Disappearing Ink

Invisible Painting

Leeching Lead into Acidic Solution

Acid and Ammonium Hydroxide Solubility Effect

Fizzing and Foaming: Reactions of Acids and Carbonates

Solubility of Copper Oxide in Water vs Acid

Buffer: Making an Acetate Buffer and Showing Its Behavior

Leeching Lead Into Acidic Solution

A capped bottle labeled “Sulfuric Acid” on a white cloth, a dark metal strip in yellow liquid inside a beaker atop a stirrer, and a dark metal strip in dark liquid inside a beaker atop a stirrer. A white stir bar is seen in each beaker.

Description: Two samples of lead metal Pb (s) are each placed in 250 mL beakers with 100 mL  0.1 M KI (aq). ~1mL of 9 M H₂SO₄(aq) is added to one of the samples. The other serves as a reference. The acidified sample leeches lead into solution which reacts with KI (aq) to form PbI₂ (s), a bright yellow precipitate which collects on the lead surface. The precipitation of PbI2(s) from 0.1M Pb(NO₃)₂(aq) and 0.1M KI (aq) can be performed as a precursor to the experiment.

Source: Maynard, J.H. via consult with Prof. Landis, C.R.  Prof. Moore, J. W UW-Madison

Year: 2018  Vol: N/A   Page: N/A

Keywords: Precipitate, pH, Lead, Solubility

Rating:

Hazard: Medium

• Acute toxicity hazard
• Aquatic toxicity hazard
• Carcinogenicity
• Mutagenicity
• Thyroid toxicity
• Skin corrosion hazard
• CNS toxicity

Effectiveness: Average

• Good connection from demo to course material
• Results are observable with guidance
• Mild effects are seen by audience
• Time to results is medium

Difficulty: Medium

• Some intermediate steps to results
• Some sequential manipulations
• Use of toxic chemicals

Safety Precautions:

• Eye protection required
• Gloves required
• Perform in a well-ventilated area
• Absorbent material on hand
• Perform on a chemically resistant surface
• Sodium bicarbonate on hand
• Prevent release of reagents to the environment

Class: Acids and Bases, Transition Metal Chemistry

Division: General

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