Instruction:

Figure 1: Plot of Langmuir adsorption isotherm at different concentrations of acetic acid From the graph, maximal substance amount of adsorbate (Amax) is calculated as and the value of adsorption constant (k) is calculated as

(Titration of acetic acid by standard (0.048 (N)) NaOH before addition of charcoal)

S.N. Volume of acetic acid (ml) Initial reading of the burette (ml) Final reading of the burette (ml) Total volume of NaOH required (ml) Strength of Acetic acid, C (N)
1 10 0 41 41 0.197
2 10 0 18.9 18.9 0.091
3 10 0 10.9 10.9 0.052
4 10 0 8.9 8.9 0.043
5 10 0 5.5 5.5 0.026

(Titration of acetic acid by standard (0.048 (N)) NaOH after addition of 1 gm charcoal)

S.N. Volume of acetic acid (ml) Initial reading of the burette (ml) Final reading of the burette (ml) Total volume of NaOH required (ml) Adsorbed acetic acid (mol/kg)
1 10 0 38.5 38.5 0.5
2 10 0 15.2 15.2 0.336
3 10 0 6.7 6.7 0.22
4 10 0 6 6 0.125
5 10 0 2.5 2.5 0.08

*** Amount of adsorbed acetic acid = (Difference in Volume of NaOH) ⨯ (concentration of acetic acid [AcOH])

*** Difference in Volume of NaOH = (Volume of NaOH after addition of charcoal (ml)) ⨯ (Volume of NaOH before addition of charcoal (ml))

S.N. Volume of NaOH before addition of charcoal (ml) Volume of NaOH after addition of charcoal (ml) Difference in Volume of NaOH [AcOH] Adsorbed acetic acid (mol/kg) (m) 1/[AcOH] 1/m
1 41 38.5 0.197 5 2
2 18.9 15.2 0.091 11.02 2.98
3 10.9 6.7 0.052 19.23 4.55
4 8.9 6 0.043 23.25 8
5 5.5 2.5 0.026 37.88 12.66
Difference in Volume of NaOH Adsorbed acetic acid (mol/kg) (m)

K1

K2

K3

K4

K5

Titration of acetic acid by standard (0.048 (N))
NaOH before addition of charcoal

S.N. Volume of acetic acid (ml) Initial reading of the burette (ml) Final reading of the burette (ml) Total volume of NaOH required (ml) Adsorbed acetic acid (mol/kg)
1
2
3
4
5

K1

K2

K3

K4

K5

K1

K2

K3

K4

K5

K1

K2

K3

K4

K5

0.0gm

U1

U2

U3

U4

U5

Titration of acetic acid by standard (0.048 (N))
NaOH before addition of charcoal

S.N. Volume of acetic acid (ml) Initial reading of the burette (ml) Final reading of the burette (ml) Total volume of NaOH required (ml) Strength of Acetic acid, C (N)
1
2
3
4
5

U1

U2

U3

U4

U5

S1

S2

S3

Standardization of 0.05 (N) NaOH
solution by standard(0.1 N) oxalic acid solution

S.N. Volume of oxalic acid (ml) Volume of NaOH (ml)
1
2
3

S1

S2

S3

S1

S2

S3

Oxalic acid

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