Preparation of standard 0.5 N sodium carbonate solution:
Sodium carbonate equivalent mass = 53 g/eq
Weight of Sodium carbonate taken =________ g
Strength of sodium carbonate = (Amt.taken x 1000 mL)/(53 g/L x 100 mL x 1 L)
Strength of sodium carbonate = _________ N
Titration I
Standardisation of HCl solution
|
S.No. |
Volume of Na2CO3 (mL) |
Burette reading |
Volume of HCl (mL) |
Indicator |
|
|
Initial |
Final |
||||
|
1 |
10 mL |
0 |
|
|
Methyl Orange |
|
2 |
10 mL |
0 |
|
||
|
3 |
10 mL |
0 |
|
||
Volume of Na2CO3 (V1) = _________ mL
Strength of Na2CO3 (N1) = _________ N
Volume of HCl (V2) = _________ mL
Strength of HCl (N2) = (V1 x N1) / V2
Strength of HCl (N2) = __________ N
Titration II
|
No. of Stages |
Vol. of extract (mL) |
Burette reading (mL) |
Strength of extract (N) |
Amt. of Na2CO3 in the extract (g) |
Percentage of extraction (%) |
|
1 |
10 mL |
|
|
|
|
|
2 |
10 mL |
|
|
|
|
|
3 |
10 mL |
|
|
|
|
|
|
Total extraction (%) |
|
|||
Calculation
Stage 1
Volume of HCl consumed = ______ mL
Strength of HCl = _______ N
Volume of extract (Na2CO3) = 10 mL
Strength of extract (Na2CO3) =(ml x N)/10 mL N
Strength of extract (Na2CO3) = ___x___ N
| Amount of Na2CO3 in the extract (g) | = (x * vol. of water * Eq.wt of Na2CO3 ) / 1000 mL |
= ____y__ g
Percentage of extraction (η1) = (y x 100)/20
= ______ %
Stage 2 & 3
Similar calculation of Stage 1
Total extraction up to stage 3
ηT = η1 + η2 + η3
ηT = ______ %
Result:
Extraction in stage 1 (η1) = _________ %
Extraction in stage 2 (η2) = _________ %
Extraction in stage 3 (η3) = _________ %
Total extraction upto 3rd stage (ηT) = _______ %
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