ANSWERS TO QUESTIONS FOR THE DAY

1.      If the hydrogen ion concentration of a solution is 1 x 10^-5. What is the pH of the solution?

       A.      1

       B.      10

       C.      5 (pH = -log [hydrogen concentration]; so pH =  -log [1 x 10^-5]; pH =5). Hint: Just take the opposite of the exponent when you have the concentration in the form 1 x 10^-5

       D.     2

2.      If the hydrogen ion concentration of a solution is 1 x 10^-3. What can you say about the solution?

A.      I t is a weak acid

B.      It is a strong acid (pH=3)

C.      It is a weak base

D.     It is a strong base

3.      If the hydroxyl ion concentration of a solution is 1 x 10^-5. What is the pH of the solution?

A.      6

B.      7

C.      8

D.     9 (The pOH= 5 from pOH = -log [hydroxyl concentration] ; since pH+pOH=14; pH=14-5=9)

4.      If the hydroxyl ion concentration of a solution is 1 x 10^-3. What can you say about the solution?

A.      I t is a weak acid

B.      It is a strong acid

C.      It is a weak base

D.     It is a strong base (pOH=3; so pH=14-3=11)