Question

Calculate the pH of each of the following solutions. a. 0.98 M KIO4 b. 0.24 M...

Calculate the pH of each of the following solutions.

a. 0.98 M KIO4

b. 0.24 M Ca(CH3CO2)2

c. 0.55 M HF
d. Mixture of 0.25 M HF in 0.25 M HBr

with work !

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Answer #1

a) a. 0.98 M KIO4

KIO4 is the salt of strong acid and strong base. so pH should be 7

pH = 7

b) 0.24 M Ca(CH3CO2)2

Ca(CH3CO2)2 is the salt of weak acid and strong base . so the pH should be more than 7

pH = 7 + 1/2 [pKa + log C]

pH =7 + 1/2 [4.74 + log 0.24]

pH = 9.06

c) c. 0.55 M HF

pH = 1/2 [pKa - log C]

pH = 1/2 [3.20 -log 0.55]

pH = 1.73

d. Mixture of 0.25 M HF in 0.25 M HBr

HBr is strong acid HF is weak acid .so HBr acidity is dominent

[H+] = 0.25 M

pH = -log [H+]

pH = 0.602

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