Homework Answers
yes. weak compounds acidity order compare based on Ka and Kb values.
more Ka value more acidic with in comparison in acids
more Kb value more basic with in comparison in bases
in case of comparision with acids and bases Ka and Kb values are compared
if acid Ka > base Kb ------------> acidic nature is dominent
if acid Ka < base Kb --------------> basic nature is dominent
if acid Ka = base Kb ---------------> it is neutral
pKa of acid = -log (1.4 x 10^-5) = 4.85
Kb of CH3COO- = 1.0 x 10^-14 / 1.8 x 10^-5
= 5.56 x 10^-10
pKb = -log Kb
= 9.26
formula in case of weak acid + weak base
pH = 7 + 1/2 [pKa - pKb]
pH = 7 + 1/2 [4.85 - 9.26]
pH = 4.80
pH < 7 . so the salt will be acidic .
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