Organic Chemistry- Gel Formation with Sodium Alginate and Calcium Chloride

Bromination of Saturated and Unsaturated Hydrocarbons

Blue Bottle

Dehydration of Sugar by Sulfuric Acid

Disappearing Coffee Cup

Formation of a Silver Mirror

Models 360

Nylon 6 – 10

Organic Synthesis With Familiar Materials

Oxidation of Primary, Secondary, Tertiary Alcohols

Oxidation of Luminol

Polyurethane Foam

Slime

Underwater Fireworks: Chlorination of Acetylene

Carbide Lamp

Differences in Miscibility of Organic Alcohols With Increasing Chain Length

Combustion of Cellulose Nitrate (Guncotton)

Different Smells of Carvone Isomers

Distinguishing Between HD and LD Polyethylene

Enviro-bond: Cleaning Oil Spills

Esterification Using a Dean-Stark Trap

Ethanol Cannon

Happy/Sad Balls

IR Demonstration I – Atomic Coupling

IR Demonstrations II – Molecular Vibrations

IR Demonstration III – Molecular Vibrations

Making a Rubber Ball from Latex

Plastic Samples

Reaction Intermediates in Organic Chemistry

Reducing Sugars and Fehling’s Solution

Rod Climbing by a Polymer Solution

Rotating Rainbows

Silly Putty

Soap Emulsifies Hydrocarbons

Superabsorbent Polyacrylate Gel

Tubeless Siphon

Alkimers

Aniline Hydrochloride-Formaldehyde Polymer

Phenol-Formaldehyde Polymer

Saponification

Relative Reactivity of Reducing Agents

Inductive Effect

Optical Activity of Racemic Mixtures With Limonene

Electrophilic Aromatic Substitution Reaction/EAS Reaction

Reactivity of Alkanes vs. Aromatic Compounds

Relationship of Absorbed Light to Observed Color

Density and Miscibility of Liquids

Extraction of Copper Ions from Solution with Orform®

Gel Formation with Sodium Alginate and Calcium Chloride

Ozonolysis

Hydrolysis of T-Butyl Chloride: A Lecture and Lab Experiment

Terephthalate Monomerization

Gel Formation with Sodium Alginate and Calcium Chloride

A gloved hand pours a cloudy liquid into a beaker containing a clear liquid. A film-like substance appears in the liquid in the beaker. The second photo shows the substance below the water line in this beaker and a semi-solid mass that has been lifted out above the water line in the beaker.
A gloved hand pours a cloudy liquid into a beaker containing a clear liquid. A film-like substance appears in the liquid in the beaker. The second photo shows the substance below the water line in this beaker and a semi-solid mass that has been lifted out above the water line in the beaker.
 

Description: A sample of 1-2% sodium alginate is dissolved in water and is then expressed via syringe into 1% (0.1M or higher) calcium chloride solution. The resulting mixture creates a crosslinked gel that may be physically separated from the aqueous phase.

Source: Vinokur, J.K., UCLA

Year:  2016  Vol: N/A   Page: N/A

Keywords: Polymers, Gel, Crosslink, Alginate

Rating:   

Hazards: Low

  • Skin irritation
  • Eye irritation
  • Electrical shock if video feed is used

Effectiveness: Average

  • Somewhat connected conceptually to course material
  • Mild effects are seen by audience
  • Time to results is low
  • High reliability

Difficulty: Low

  • Simple adding of nonreactive reagents
  • Simple manipulations for most to perform
  • Simple procedures

Safety Precautions:

  • Eye protection required
  • Gloves required
  • UL approved three prong plug and outlet if video feed is used
  • Absorbent materials on hand

Class: Intermolecular Forces, Polymers

Division: General, Physical Chemistry, Organic Chemistry

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