You will explore the properties of acids and learn how to detect them.
After completing this tutorial, you will be able to complete the following:
One of the most common definitions of an acid is that it is a substance that increases the amount of hydrogen ions in an aqueous solution. While some acids are stronger than others, most are hard to recognize in a solution if it is not labeled. In order to identify whether or not a substance is an acid, laboratory tests are conducted, which result in a reaction if an acid is present.
One of these tests is the reaction with litmus paper. There are two common types of litmus paper: blue and red. Both these papers work the same way: each turns blue in the presence of a base, and red in the presence of an acid. To test the solution using litmus paper, all one needs to do is place a drop on the paper. In the presence of an acid, regardless of strength, the red paper will remain red, and the blue will turn red.
A second common test is to see if the acid reacts in the presence of a base. In this case, carbonate is used for the base. When the acid and the base come into contact, a neutralization reaction occurs, and carbon dioxide is released as a gas. When the gas is released, the solid carbonate appears to fizz, indicating a reaction has occurred. The third test is placing the acid on a metal, which then causes corrosion or a change in color.
|Approximate Time||20 Minutes|
|Pre-requisite Concepts||There are no specific pre-requisite requirements necessary.|
|Type of Tutorial||Experiment|
|Key Vocabulary||acidic solutions, carbonate, corrosion|