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pH_of_weak_acid_wksht

# pH_of_weak_acid_wksht - pH of Weak Acids 1 The acid...

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pH of Weak Acids 1) The acid dissociation constant (K a ) for benzoic acid is 6.3 x 10 -5 . Find the pH of a 0.35 M solution of benzoic acid. 2) Find the pH of a 0.275 M hypochlorous acid solution. K a = 3.0 x 10 -8 .

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Everett Community College does not discriminate on the basis of race, religion, creed, color, national origin, age, sex, marital status, disability, or veteran status. 3) Find the pH of a solution that contains 0.0925 M nitrous acid (K a = 4.5 x 10 -4 ) and 0.139 M acetic acid (K a = 1.8 x 10 -5 ). 4) Find the pH of a 0.00125 M hydroazoic acid solution. K a = 1.9 x 10 -5 .
pH of Weak Acids - Solutions Note : The significant figures in the concentration of [H + ] or [OH - ] is equal to the number of decimal places in the pH or pOH and vice versa. 1) The acid dissociation constant (K a ) for benzoic acid is 6.3 x 10 -5 . Find the pH of a 0.35 M solution of benzoic acid. x = moles/L formed HC 7 H 3 O 2(aq) H + (aq) + C 7 H 3 O 2 - (aq) initial 0.35 M 0 M 0 M change - x M + x M +x M equilibrium (0.35 x) M x M x M Note that: (0.35 x) M ≈ 0.35 M so K a = [H + ][ C 7 H 3 O 2 - ] = (x)(x) = (x)(x) = x 2 = 6.3 x 10 -5 [HC 7 H 3 O 2 ] (0.35 x) (0.35)

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pH_of_weak_acid_wksht - pH of Weak Acids 1 The acid...

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