Recommended for Middle School through High School.
In this experiment, you will study the electrical conductivity of water and various water solutions. A solution can contain molecules, ions, or both. Some substances, such as sucrose (C12H22O11), dissolve to give a solution containing mostly molecules. An equation representing the dissolving of sucrose (table sugar) in water is
Other substances, such as calcium chloride (CaCl2), dissolve in water to produce a solution containing mostly ions. An equation is
In this experiment, you will
Write equations for the dissolving of substances in water.
Use a Conductivity Probe to test the electrical conductivity of solutions.
Determine which, molecules or ions, are responsible for electrical conductivity of solutions.
Sensors and Equipment
This experiment features the following Vernier sensors and equipment.