Question

Complete the following table. (AH solutions are at 25C.) [H30+] [OH-] pH Acidic or Basic _____...

Complete the following table. (AH solutions are at 25C.)

[H30+] [OH-] pH Acidic or Basic

_____ ____ 3.15 ____________

3.7x10^-9 ____ ____ ____________

_______ ____ 11.1 ____________

_______ 1.6x10^-11 ___ ____________

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Homework Answers

Answer #1

use the formulas

[H3O+] [OH-] = 1.0 x 10^-14

pH = -log[H3O+]

pOH = -log[OH-]

pH + pOH = 14

first row

pH = 3.15

pOH = 14-3.15 = 10.85

[H3O+] = 10^-pH = 10 ^ -3.15 = 7.07 x 10^-4

[OH-] = 10^-pOH = 10^-10.85 = 1.41 x 10^-11

acidic

row-2

[H3O+] = 3.7 x 10^ - 9

[OH-] = 1.0 x 10^-14 / 3.7 x 10^-9 = 2.7 x 10^-6

pH = -log[H3O+] = -log[3.7 x 10^ - 9] = 8.43

pOH = 14-pH = 14 - 8.43 = 5.56

basic

row-3

[OH-] = 1.6 x 10^-11

[H3O+] = 1.0x 10^-14 / 1.6 x 10^-11 = 6.25 x 10^-4

pH = -log[H3O+] = -log[6.25 x 10^-4] = 3.2

pOH = 14-pH = 10.8

acidic

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