Name:

Water, pH, and Buffers – Report File

Exercise 1:  Water and its Unique Properties

Data Table 1 – Needle Observations 
Observations	
Vertical:	Horizontal:	

Data Table 2 – Paper clips needed to beak surface tension
Hypothesis:	Result:	
_____ Paper clips	_____ Paper clips	

Data Table 3 – Drops of water
Hypothesis:	Result:	
_____ Drops of water	_____ Drops of water	

Questions for Part I, Part II, and Part III: 
 
A.	How did the experiment in Part I demonstrate surface tension? Use your experiment observations when answering this question.
Answer

B.	In Part I, when adding the needle to the water, which approach worked best to balance the needle on the water – the vertical or horizontal placement?  Explain your answer. 
Answer

C.	In Part II, how did your paper clip hypothesis compare to your paper clip results? 
Answer

D.	In Part III, how were the properties of adhesion and cohesion demonstrated in the experiment? 
Answer

Data Table 4 – Part IV observations
Observations:  	

Question for Part IV:

A.	How did this activity demonstrate capillary action? Explain your answer using your experiment results and observations. 
Answer

Exercise 3:  Testing Common Household Materials for pH Values

Data Table 5 – pH observations 
Well 
Plate	Item tested	Homemade
pH strip	
		Color	pH	
1	Water			
2				
3				
4				
5				
6				
7				
8				
9				
10				

Data Table 6 — Analysis of results

Well plate	Item tested	Acid/Base/Neutral?	Explanation:	
1	Water			
2				
3				
4				
5				
6				
7				
8				
9				
10				

Questions:

A.	Why is the pH scale important in science? Give one example of scientific applications. 
Answer

B.	If a chemical has a pH of 3, how could you change its pH value to be more basic? 
Answer