1) A buffer solution contains 0.356 M
C6H5NH3Cl
and 0.303 M
C6H5NH2
(aniline). Determine the pH
change when 0.066 mol
NaOH is added to 1.00 L of the
buffer.
pH after addition − pH before addition = pH
change=?
2) Determine the pH change
when 0.068 mol HCl is added to
1.00 L of a buffer solution that is
0.462 M in CH3COOH and
0.227 M in
CH3COO-.
pH after addition − pH before addition = pH change
=?
1) .
pKb of aniline = 9.13
pOH = pKb + log [salt / base]
= 9.13 + log [0.356 / 0.303]
= 9.20
pH = 4.80
after additon of NaOH.
pOH = pKb + log [salt - C / base + C]
= 9.13 + log [0.356 - 0.066 / 0.303 + 0.066]
= 9.025
pH = 4.98
pH change = 4.98 - 4.80
pH change = 0.18
2)
pH = pKa + log [salt / acid]
= 4.74 + log [0.226 / 0.462]
pH = 4.43
after addition of HCl
pH = 4.74 + log [0.227 - 0.068 / 0.462 + 0.068]
= 4.22
pH change = - 0.21
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