Page 125 - Demo

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Solutions and Solubility
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Solutions and Solubility—Demonstration Kits,
continued
The Colorful Silicate Garden—
Chemical Demonstration Kit
By: The Flinn Staff
In a matter of seconds, columns of various colors sprout up from the bottom of a beaker containing a clear liquid. The crystals form like stalagmites in a cave and will continue to grow for several days. This beautiful crystal garden is fascinating to watch. Demonstration Notes included. Concepts: Formation of insoluble silicates, osmosis, crystal structures. Time Required: 15 minutes
Chemicals Provided: Sodium silicate solution, aluminum chloride hexahydrate, iron(III) chloride, copper(II) chloride and cobalt nitrate.
Unexpected Precipitation—A Discrepant
Chemical Demonstration Kit
By: The Flinn Staff
A precipitate forms as a solution is heated and dissolves again as it cools—opposite of what is typically observed in precipitation reactions. This “discrepant demonstration” is great for introducing the idea that there are exceptions to many rules in chemistry! The solution may be reused many times.
Concepts: Exceptions to chemical rules, precipitation, saturation, solubility.
Time Required: 15 minutes
Chemicals Provided: Calcium acetate saturated solution.
Upset Tummy? MOM to the Rescue!
Chemical Demonstration Kit
By: The Flinn Staff
Mix a suspension of Milk of Magnesia (MOM) with universal indicator, add simulated stomach acid, and observe the dramatic rainbow of colors as the antacid dissolves in the acid! And... it’s not over yet! Simply add more acid and watch as the colors continue to change and indicate the reaction of MOM with the “stomach acid.” An eye-catching, spectacu- lar demonstration to teach solubility, acid–base and “antacid-testing” consumer chemistry! Demonstration Notes included.
Concepts: Solubility, Ksp, acid–base neutralization, antacids.
Time Required: 15 minutes
Materials Provided: Milk of Magnesia (MOM) suspension, hydro- chloric acid solution, universal indicator solution, Beral-type pipets.
See free video at flinnsci.com.
Santa in a Snowstorm—A Winter Holiday
Chemical Demonstration Kit
By: The Flinn Staff
Here comes Santa Claus, here comes Santa Claus! Capture the attention of your students with this fun holiday seasonal demonstration. Explore the topics of solubility and saturation with this easy-to-prepare demon- stration. Simply place excess benzoic acid in a heated solvent until a solution forms. As the solution cools excess benzoic acid precipitates out in a “snow-like” form. It’s a winter wonderland in a bottle! Concepts: Solubility, saturation, solvents.
Time Required: 15 minutes
Materials Provided: Benzoic acid, giant snow “globe,” bendable Santa.
The Colorful Silicate Garden—Chemical Demonstration Kit AP4424
Catalog No.
Description
Price/Each
AP4424
The Colorful Silicate Garden— Chemical Demonstration Kit
$47.25
Catalog No.
Description
Price/Each
AP6651
Unexpected Precipitation—
A Discrepant Chemical Demonstration Kit
$13.15
Unexpected Precipitation—A Discrepant Chemical Demonstration Kit AP6651
Upset Tummy? MOM to the Rescue! Chemical Demonstration Kit AP5934
Santa in a Snowstorm— A Winter Holiday Chemical Demonstration Kit
AP6186
Catalog No.
Description
Price/Each
AP5934
Upset Tummy? MOM to the Rescue! Chemical Demonstration Kit
$22.70
Catalog No.
Description
Price/Each
AP6186
Santa in a Snowstorm—A Winter Holiday Chemical Demonstration Kit
$14.00