Lactic acid CH3CHOHCOOH is found in sour milk, in sauerkraut, and in muscles after activity. Lactic acid is a weak monoprotic acid in aqueous solution, with a Ka = 1.4x10^-4 at 25 degree. 2.15g of sodium hydroxide was added to 8.00x10^2 mL of an aqueous solution containing 0.100mol/L lactic acid.
a) Determine the pH of the resulting solution
b)determine the concentrations of all neutral acid ionic species (other than water) present in the resulting solution
pKa = 3.85
moles of NaOH = 2.15 / 40 = 0.05375 mol
moles of lactic acid = 0.100 x 0.800 = 0.0800 mol
a)
HA + NaOH ----------------> NaA + H2O
0.08 0.05375 0 0
0.02625 0 0.05375
pH = pKa + log [salt / acid]
= 3.85 + log [0.05375 / 0.02625]
pH = 4.16
b)
[Na+] = 0.05375 / 0.8
[Na+] = 0.0672 M
=
Lactic acid CH3CHOHCOOH is found in sour milk, in sauerkraut, and in muscles after activity. Lactic...
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