Question
Citric acid is a triprotic acid with Ka values of 3.14, 5.95, and 6.39. Estimate the pH of a 0.15 M solution of a monosodium salt
Answers
Eevee
salt??? that's imposible
DrBob222
C'mon Eevee. NaCl is not the only salt.
If we call citric acid H3C, then the monosodium salt will be NaH2C.
The pH of that salt in solution will be determined by the hydrolysis of the salt.
...........H2C^- + HOH ==> H3C + OH^-
I..........0.15............0......0
C...........-x.............x......x
E........0.15-x............x......x
Kb for H2C^- = (Kw/k1 for H3C) = (x)(x)/(0.15-x)
Solve for x = OH^- and convert to pH.
If we call citric acid H3C, then the monosodium salt will be NaH2C.
The pH of that salt in solution will be determined by the hydrolysis of the salt.
...........H2C^- + HOH ==> H3C + OH^-
I..........0.15............0......0
C...........-x.............x......x
E........0.15-x............x......x
Kb for H2C^- = (Kw/k1 for H3C) = (x)(x)/(0.15-x)
Solve for x = OH^- and convert to pH.