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.