Calculate the pH of the following solutions: a) [H+] = 3.75 x 10-6 M solution b)

Question

Calculate the pH of the following solutions: a) [H+] = 3.75 x 10-6 M solution b) J. [H+] = 2.5 M 4. Calculate the [H'1 ion concentration for the following solutions: a) [OH]= 2.5x10-4M. pH = 8.5 b) ow does a buffer solution resist pH change after the addition of a strong acid? 5. H 6. Add either increase or decrease on each blank to explain the effect of adding NaOH to water. Hint: remember that pH is an inverse scale, if [H decreases, pH increases. Adding NaOH to water causes the [OH] to and the [H . This change in [H ] corresponds to a(n) to on the pH scale. 155

Explanation / Answer

3)
a)

use:
pH = -log [H+]
= -log (3.75*10^-6)
= 5.43
Answer: 5.43

b)

use:
pH = -log [H+]
= -log (2.5)
= -0.398
Answer: -0.398

4)
a)
use:
pH = -log [H+]
8.5 = -log [H+]
[H+] = 3.16*10^-9 M
Answer: 3.16*10^-9 M

b)
use:
[H+] = Kw/[OH-]
Kw is dissociation constant of water whose value is 1.0*10^-14 at 25 oC
[H+] = (1.0*10^-14)/[OH-]
[H+] = (1.0*10^-14)/2.5E-4
[H+] = 4.0*10^-11 M
Answer: 4.0*10^-11 M

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