Deline Chem 220 CC#1  5 points  Name ____________________________ section ____

Circle the best choice. Attach your work to the content check.

1. Given the following equation

H₂O_(l)  + HPO₄^2-  ó H₂PO₄^1-  + OH^1-

A)    H₂O is an acid and OH^1- is its conjugate acid.

B)     H₂O is a base and OH^1- is its conjugate base.

C)    H₂O is an acid and OH^1- is its conjugate base.

2. Which solution has the highest pH?

A) 0.1 M HCl

B) 0.1 M NaOH

C) 0.1 M NH₃

D) 0.1 M CH₃COOH

3. Calculate the pH of 0.017 M Ba(OH)₂.

            A) 0.034

            B) 1.47

            C) 1.77

            D) 12.13

            E) 12.53

4. A sample of sea water has a pH of 8.10. What is the hydronium concentration?

            A) 1.0 E -8 M

            B) 8.0 E -1 M

            C) 7.9 E -9 M

            D) 1.3 E -6 M

            E) 5.9 M

5. Milk of Magnesia has a pH of 10.40. When is the [ OH^1- ] ?

            A) 1.0 E -7 M

            B) 2.5 E -4 M

            C) 4.0 E -11 M

            D) 1.0 E -4 M

            E) 3.6 M