Question

# 9.35 Determine the pH of water solutions with the following characteristics. Classify each solution as acidic,...

9.35 Determine the pH of water solutions with the following characteristics. Classify

each solution as acidic, basic, or neutral.

a) [H+] = 1.0 x10-4 M

b) [OH-] = 5.0 x10-2 M

c) [H+] = [OH-]

d) [H+] = 8.0 x10-9 M

e) [OH-] = 4.0 x10-10 M

a) pH = -log[H+] = -log(1.0 X 10-4) = 4

solution is acidic

b) pOH = -log[OH-] = -log(5.0 X 10-2) = 1.30

pH = 14 - pOH = 14 - 1.30 = 12.70

solution is besic

c) [H+] = [OH-]

[H+] = [OH-] = x

[H+] X [OH-] = 1 X 10-14

x2 = 1 X 10-14

x = 1 X10 -7

[H+] = 1 X10 -7

pH = -log[H+] = -log(1.0 X 10-7) = 7

solution is neutral

d)

[H+] = 8.0 X10 -9

pH = -log[H+] = -log(8.0 X 10-9) = 8.09

solution is Besic

e)

pOH = -log[OH-] = -log(4.0 X 10-10) = 9.4

pH = 14 - pOH = 14 - 9.4 = 4.6

solution is Acedic

pH = 1 to 7 solution acedic

pH = 7 solution neutral

pH = 7 to 14 solution besic

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