Properties of Acids and Bases
One purpose of this lesson is for you to become familiar with many aspects of acids and bases. Let's start with some of the observable properties of acids and bases. Take a look at exercise 2 in your workbook. In this exercise you will test the reaction of an acid and a base with the various chemicals listed here. For the acid use 1 molar hydrochloric acid (1M HCl). For the base use 1 molar sodium hydroxide (1M NaOH).
When you are in the lab you will perform these tests and the others in the exercise, then record the results in the blank spaces on the chart.
When you have completed exercise 2, you will have experimented with several properties of acids and bases. Those properties give you a variety of ways that can be used to test whether a material is an acid or a base (which comes up in exercise 4). Let me take a minute to touch on a few of them.
Another important characteristic of acids and bases is that they can neutralize one another. To point that out I'd like you to try a short little test when you are in the lab. The instructions are in exercise 3 in your workbook. Put a few drops of 1 M sodium hydroxide solution into a test tube and add a drop of phenolphthalein solution. It will turn pink to indicate that the solution is basic. Then start adding, drop by drop some 1 M hydrochloric acid to that solution, and you will find that after the proper number of drops the acid will have neutralized the base and converted the phenolphthalein back into a colorless solution. These chemicals are available in the lab and I suggest that you try this short experiment yourself. (You may remember doing this in lesson 1 of CH-104.)
Identifying Acids and Bases
The reactions observed in exercise 2 will help you to experimentally identify acids and bases.
When you are in the lab, get three lettered solutions and identify each one as being either an acid, a base, or neutral, using 2 different tests for each unknown from the tests you performed in exercise 2. Record your observations and conclusions in the space provided in exercise 4.
Distance Learning questions
Clackamas Community College