Acid and Base Rainbows
Students are introduced to the differences between acids and bases and how to use indicators, such as pH paper and red cabbage juice, to distinguish between them. They learn why it is important for engineers to understand acids and bases.
Students explore acids and bases and use indicators such as litmus paper to distinguish between themCopyright http://f.tqn.com/y/chemistry/1/W/Z/P/2/137357467.jpg
Measuring pH is fundamental science that is used by many engineers: Environmental and chemical engineers examine pollutant substances to find out whether they are acid or base to know what kind of reactions they cause. Electrical engineers design batteries. Chemical engineers design everything from pharmaceuticals to soap to glue to bubble gum. Civil engineers design water and waste treatment plants for towns and factories. Using the basic concept of acids and bases, engineers are able to create a lot of things that contribute to the health, happiness and safety of society.
After this activity, students should be able to:
- Describe some general characteristics of acidic, basic and neutral solutions.
- Calculate and interpret the averages of pH trials.
- Explain why engineers measure the pH of substances with which they are working.
- Use their knowledge of pH to describe some effects of acid rain.