pH Problems                                                                                                    Name_____________________

Science 1                                                                                                         Date _________ Period ______

 

1.  What is the formula for a hydronium ion? _______  What is its charge?_________ Why does it have this charge?_________________________________________________________________ Draw a hydronium ion:

 

 

 

2.  What is the formula for a hydroxyl ion? ________  What is its charge?________ Why does it have this charge?_________________________________________________________________ Draw a hydronium ion:

 

 

 

 

 

3.  What fraction of the molecules in pure liquid water are hydronium ions?

 

 

4.  What fraction of the molecules in pure liquid water are hydroxyl ions?

 

 

5.  If a solution has more hydroxyl ions than hydronium ions it is a(n) acid/base.  (circle one)

 

6.  If a solution has more hydronium ions than hydroxyl ions it is a(n) acid/base.

 

7.  Look through your textbook.  Name several acids.  Name several bases.  Give the name and chemical formulas.

 

     Name                          Chemical Formula                    Acid or Base?

 

 

 

 

8.  What is the pH for the following ratios of hydronium ions to water molecules? Acid or Base?

 

a) 1 :  10,000                                                                    

b) 1 :  100,000,000                 

c) 1 :  10     

d) 1 :  10,000,000,000,000      

 

9.  Write the ratio of hydronium ions to water molecules for the following pH's.

 

     a)  pH = 3

     b) pH = 12

     c) pH = 6

     d) pH = 16

 

10. (Extra Credit!)  Which of the pH's in #9 is impossible?  Why is it impossible??!!!