Ellen

**Activity One** On [|this site], you will find information about pH and the pH scale.
 * 1) What does the letters pH mean? pH is a measure of how acidic or basic a liquid is.
 * 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? Litmus Paper
 * 4) What is the normal pH of rainwater? Five and a half.

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? It's characteristics.
 * 2) On the pH scale, where would acids be found? 0-7
 * 3) Where on the pH scale would bases be found? 7-14
 * 4) What characteristics describe acids? Corrosion, solid, and conducts electricity.
 * 5) What characteristics describe bases?Conducts electricity and corrosion
 * 6) What would a pH of 7 indicate? neutral

[|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? Textiles, dying, paper, pulp, chemistry, metals, and electricity.
 * 2) What is the pH of blood? Is this acidic or basic? 7.4, basic
 * 3) Is an apple acidic or basic? How do you know? Acid. It's an acid because it has vitamin C in it.
 * 4) What is the pH of tears? How does this compare to blood pH? 7.1-7. 4
 * 5) What is the pH of coffee? 5-5.5
 * 6) What is the pH of stomach fluids? Does this surprise you? About 1, No Because it was discussed in the class.
 * 7) Which substance on this scale has the lowest pH? Is this surprising to you? Fluoroantimonic.No..... Don't know what it is.
 * 8) Which substance on this scale is closest to neutral?distilled water.
 * 9) If distilled water has no ions at all, what would its pH probably be? 7