Name___________________________________________________Date_______________Period_________
The pH of a solution is a measurement of how acidic or basic a solution is. An easy way to
measure the pH of a solution is to use pH paper.
Prelab: Understanding the pH scale
1.
Which numbers indicate an acid?
2.
Which numbers indicate a base?
3.
Which number indicates a neutral solution?
4.
Which number indicates the strongest acid?
5.
Which number indicates the strongest base?
6.
Which number indicates the weakest acid?
7.
Which number indicates the weakest base?
8.
What does a buffer do?

10
11
8
9
12
6
7
4
5
2
3
Solution Name
1
Data
Prediction
(Acid/Base/Neutral) pH based on paper reading (1-14) pH based on meter reading (1-14)
Was your prediction correct?
Post-Lab: Analysis & Conclusions
1.
Of the solutions you tested, name the: a. strongest acid: _______________________________________ b. weakest acid: ________________________________________ c. neutral solution: ______________________________________ d. strongest base: _______________________________________ e. weakest base: _______________________________________