8. A solution that has a pH of 2 is how many times more acidic than a solution w

Question

8. A solution that has a pH of 2 is how many times more acidic than a solution with a pH of 6 9. What is the pH of a solution with a hydronium ion [H] concentration of 5.2 x 1011 M? 10. Calculate the hydronium ion [H] concentration in a solution that has a pH of 3.2. 11. What is the pH of a 0.0735 M NaOH solution? (note: sodium hydroxide is a strong base.) 12. What is the pH of a 0.0040 M Ba(OH)2 aqueous solution, assuming that the compound completely ionizes in water? How many moles of the base NaOH can be completely neutralized with 0.769 moles of H2S04? 13. 14. A buffered solution: a) turns light pink at the endpoint of a titration b) is composed of a strong acid and its conjugate base c increases the hydronium ion concentration when bases are added d) resists changes in the pH when strong acids or bases are added e) none of these choices

Explanation / Answer

8)

use:

pH = -log [H+]

2 = -log [H+]

[H+] = 1*10^-2 M

use:

pH = -log [H+]

6 = -log [H+]

[H+] = 1*10^-6 M

ratio = (1*10^-2)/(1*10^-6) = 10000

Answer: 10000 times more acidic

9)

use:

pH = -log [H+]

= -log (5.2*10^-11)

= 10.284

Answer: 10.28

10)

use:

pH = -log [H+]

3.2 = -log [H+]

[H+] = 6.31*10^-4 M

Answer: 6.31*10^-4 M

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