Hannah

**Activity One** On [|this site], you will find information about pH and the pH scale.
 * 1) What do the letters pH mean? It stands for p= potential of H= hydrogen.
 * 2) On the pH scale, how much difference is there between units (for example, between a pH of 5 and 6)? 10X
 * 3) What material is used to measure pH? indicator paper (litmus paper) or a pH meter.
 * 4) What is the normal pH of rainwater? 5.6

Click on to the[| Miami Museum of Science site] to find out all about pH.

What do the letters pH stand for? What does the pH scale measure? Discover the answers to these and other questions on the [|Chem4kids] site.
 * 1) What makes a substance either acidic or basic? For it to be basic it has to have a pH grater than 7. For it to be acidic it has to be less than 7.
 * 2) On the pH scale, where would acids be found? Behind the 7.
 * 3) Where on the pH scale would bases be found? In front of the 7.
 * 4) What characteristics describe acids? corrosive, react with metals, conducts electricity, and they taste sour.
 * 5) What characteristics describe bases? corrosive, conducts electricity, and they taste bitter.
 * 6) What would a pH of 7 indicate? Water
 * 7) Take the quiz on acids and bases (link found at the bottom of the page).

[|This website] contains basic information written in a language that is easy to understand. Be sure to visit all links within this website.
 * 1) In what kinds of fields (or industries) would it be necessary to measure pH?
 * 2) What is the pH of blood? Is this acidic or basic?
 * 3) Is an apple acidic or basic? How do you know?
 * 4) What is the pH of tears? How does this compare to blood pH?
 * 5) What is the pH of coffee?
 * 6) What is the pH of stomach fluids? Does this surprise you?
 * 7) Which substance on this scale has the lowest pH? Is this surprising to you?
 * 8) Which substance on this scale is closest to neutral?
 * 9) If distilled water has no ions at all, what would its pH probably be?