Acid in the Water CycleSection 5.16

Human Activities Can Alter the Environment

How are humans impacting the environment and how can we minimize the negative effect we have on ecosystems?

The Problems of the Earth: http://www.youtube.com/watch?v=3whBtkLueNQ

Discuss!

What did you see in the video? What’s causing it?

Can you name any Acidic Food?

How do you know it is “acidic”?

Acidic Food Example

Source of Acid Rain

Pollutants› Burning fossil › Nitrogen fertilizers

Pollutants in atmosphere combine with water droplet = acid rain

Where does acid rain go? Water cycle!

Consequences of Acid Rain Share your ideas Southern Europe, Eastern North

America, Indian and China (Asia)

pH Scale

p – potenz, H – hydrogen Scale shows how strong acids are Pure water: pH=7 Anything with a pH<7 is acidic, while

ph>7 is basic Normal rain is 5.7, slightly acidic Acid rain: pH=?

pH Measurement

pH indicators› Litmus paper

pH meter and probe

Next class...

pH lab Technology? Lab report format Homework

› Introduction: Background Questions