ph presentation

Ch. 18 & 19 - Acids & BasesCh. 18 & 19 - Acids & Bases

pH

A. Ionization of WaterA. Ionization of Water

H2O + H2O H3O+ + OH-

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

A. Ionization of WaterA. Ionization of Water

Find the hydroxide ion concentration of 3.0 10-2 M HCl.

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

[3.0 10-2][OH-] = 1.0 10-14

[OH-] = 3.3 10-13 M

Acidic or basic?Acidic

[H3O+] and [OH-] balance each other, more of one means less of the other

pH = -log[H3O+]

B. pH ScaleB. pH Scale

0

7INCREASING

ACIDITY NEUTRALINCREASING

BASICITY

14

pouvoir hydrogène (Fr.)“hydrogen power”


pH of Common SubstancespH of Common SubstancespH of Common SubstancespH of Common Substances


pH = -log[H3O+]

pOH = -log[OH-]

pH + pOH = 14


What is the pH of 0.050 M HNO3?

pH = -log[H3O+]

pH = -log[0.050]

pH = 1.3

Acidic or basic?Acidic


What is the molarity of hydronium ions in a solution that has a pOH of 9.6?

pH + pOH = 14

pH + 9.6 = 14

pH = 4.4

Acidic

pH = -log[H3O+]

4.4 = -log[H3O+]

-4.4 = log[H3O+]

[H3O+] = 4.0 10-5 M

ph presentation

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