Practice for Quiz 2    More Acids and Bases +  Alkanes and Alkenes

1. What is the pH of the following solutions?

a. A sodium hydroxide solution that has a pOH of 3

b. A 0.1 M sodium hydroxide solution

c. A 0.01 M nitric acid solution

d. A 0.0134 M nitric acid solution

e. A 0.025 M potassium hydroxide solution

f. A 0.1 M phosphoric acid solution (Ka= 5.93 x 10^-3)

2. What is the hydronium ion concentration of the following solutions?

a. An HCl solution with a pH of 3.4

b. An acetic acid solution with a pH of 3.4

c. A sodium hydroxide solution with a pH of 3.4

d. A sodium hydroxide solution with a pOH of 11.6

3. What is the pH of a solution if 5 mL of a 0.2 M HCl solution is added to 200 mL of water?

4. What is the pH of a solution if 5 ml of a 0.2 M acetic acid solution is added to 200 ml of water?

5. Calculate the pH of a buffer that contains 15 grams of NaH₂PO₄ and 13 grams of Na₂HPO₄.

6. What is the pKb for Sodium acetate?  (The Ka for acetic acid is 1.8 x 10^-5.)

7.  Why does oil have a lower density than water?

8.  For each of the following, indicate if the two structures represent the same molecule or if the structures represent either constitutional or cis/trans isomers.  If there is a chiral center, mark it with a star.  For each structure, write the molecular formula below it.

9.  Draw all of the possible structures for C₅H_12.

_{10.  What will happen when the following solutions are mixed:}

_{a.  Gasoline and vegetable oil}

_{b.  Gasoline and water}

_{c.  Gasoline and sugar}

_{d.  Sugar and water}

_{11.  Which of the following molecules has the highest boiling point?  For each molecule, indicate the primary intermolecular force that is present.}

_{a.  pentane or octane}

_{b.  cylcohexane or  hexane}

_{c.  water or hexane}

_{12.  You are the unwitting victim of a friend who has left their five year old child in your care.  After an exhausting day of accident prevention and non stop feeding, the child escaped your watchful eye and has managed to get chewing gum (a non polar, non water soluble polymer of mostly carbon) in his hair.    What could you use to remove it before the MOM gets home.  Explain how your choice of chewing gum remover works in terms of intermolecular forces.} 

_{13.  Describe how a saturated fat is different from an unsaturated fat.}

_{14.  Complete the following table}

Molecular formula	Example of a possible structure	Alkane, Alkene, Aromatic
C4H10	CH3CH2CH2CH3  or	Alkane
C6H6	.	.
C5H8	.	.
C5H10	.	.