Preparation of std. Zinc sulphate (0.5 M) solution: (100 mL SMF)
Molecular weight of Zinc sulphate = 287.56 g/mol
Amount taken = _________ g
Strength of Zinc sulphate = (Amt. taken x 1000 mL) / (287.56 g/mol x 1 L x 100 mL)
Strength of Zinc sulphate _____y_____ M
Amount on Zn in 20 mL = y x 65.38 x 20
=_____Z____ mg
Preparation of 20% Di-(2 ethyl hexyl) Phosphoric acid solution:
Mix 10 mL of Di-(2 ethyl hexyl) Phosphoric acid and 40 mL of Kerosene
Titration I
Standardisation of EDTA solution:
| S.No. | Volume of ZnSO4 (mL) | Burette reading | Volume of EDTA (mL) | Indicator | |
| Initial | Final | ||||
| 1 | 1 mL | 0 | Eriochrome Black T | ||
| 2 | 1 mL | 0 | |||
| 3 | 1 mL | 0 | |||
Volume of ZnSO4 (V1) = _________ mL
Strength of ZnSO4 (M1) = _________ M
Volume of EDTA (V2) = _________ mL
Strength of EDTA (M2) = (V1 x M1)/(V2)
Strength of EDTA (M2) = _____x____ M
Table I
| Stage | Vol. of aq layer A | Vol. of aq layer taken for titration B | Volume of EDTA mL (Burette reading) C | Strength of ZnSO4 D | Amt. of ZnSO4 mg/mL E | Zn in aq. Layer F |
|
I II III |
20 mL 19 mL 18 mL |
1 mL 1 mL 1 mL |
= (C.x)/B |
= D(65.38) |
=AE |
Table II
|
Stage |
Ini. Amt of Zn in aq. Layer I |
Zn in aq. Layer F |
Amt. of Zn in Org. layer G |
% of extraction ƞ |
|
I II III |
=Z =A.E1 =A.EII |
|
=I-F |
=(G/I)x100 |
Total percentage of extraction = ƞ1 + ƞ2 + ƞ3
Stripping Process:
Total amount of Zn in organic layer = GI + G2 + G3 (Theoretical)
We take 20 mL organic layer for stripping and 20 mL dil.HCl
Amount of Zn in 20 mL organic layer = Theoretical x (20/30) g
Burette reading (EDTA) of stripping = ____h_____ mL
Concentration of Zn = (h.x)/10 mL
Amount of Zn in the solution = ((h.x)/10 mL) x 65.38 g/mol x 20
=__________ mg
Stripping value = (Amount of Zn in the solution / Amount of Zn in 20 mL organic layer) x 100
Result:
Percentage of Extraction efficiency:
1st stage =
2nd stage =
3rd stage =
Stripping efficiency
1st Stage =
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