Note: (show all your works and measure that you
answer all questions from part A to part B below.
Sorry for long questions, but I give thanks to anyone who can help
me)
Homework Answers
a) pH = pKa + log [NaCOOH] / [HCOOH]
pKa = 3.74
[NaCOOH] = 15 x 3.2 / 30 = 1.6 M
[HCOoH] = 15 x 3.2 / 30 = 1.6 M
salt = acid so pH = pKa
pH = 3.74
b) [sodium acetate] = (3.2 / 82.03) (1 / 1) = 0.039 M
pH = pKa + log [sodium acetate] / [acetic acid]
pKa = - log [1.8 x 10-5] = 4.74
pH = 4.74 + log [0.039]/ [0.30]
pH = 4.74 - 0.89
pH = 3.85
Add Answer to:
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questions from part A to part B
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