Preparation and Standardization of 0.05 M Disodium Ethylenediaminetetraacetate (EDTA) Preparation: (prepare 1/2 formulation) 1. Dissolve 18.6 g of disodium ethylenediaminetetraacetate in 1000 ml water. Standardization: (prepare whole formulation, perform three trials) 1. Weigh accurately about 200 mg of chelometric standard calcium carbonate. 2. Transfer to a 400-ml beaker, add 10 ml of water and swirl to form a slurry. 3. Cover the beaker with a watch glass and introduce 2 ml of diluted hydrochloric acid from a pipet inserted between the lip of the beaker and the edge of the watch glass. 4. Swirl the contents of the beaker to dissolve the calcium carbonate. 5. Wash down the sides of the beaker, the outer space of the pipet and the watch glass with water and dilute with water to about 100 ml. 6. With stirring the solution, add about 30 ml of disodium ethylenediaminetetraacetate solution from a 50-ml burette. 7. Add 15 ml of sodium hydroxide TS and 300 mg of hydroxy naphthol blue indicator. The adilion of the indicator will turn the colorless solution to a dark purple color. 8. Continue the titration with the disodium EDTA solution to a distinct blue end point. 9. Record the data of the first trial, then conduct two more trials. Data and Results T1 T2 T3 Added volume of titrant 6.4 ml 5.7 ml 6.9 ml Final volume of titrant Weight of analyte Computed Molarity (M)
Preparation and Standardization of 0.05 M Disodium Ethylenediaminetetraacetate (EDTA) Preparation: (prepare 1/2 formulation) 1. Dissolve 18.6 g of disodium ethylenediaminetetraacetate in 1000 ml water. Standardization: (prepare whole formulation, perform three trials) 1. Weigh accurately about 200 mg of chelometric standard calcium carbonate. 2. Transfer to a 400-ml beaker, add 10 ml of water and swirl to form a slurry. 3. Cover the beaker with a watch glass and introduce 2 ml of diluted hydrochloric acid from a pipet inserted between the lip of the beaker and the edge of the watch glass. 4. Swirl the contents of the beaker to dissolve the calcium carbonate. 5. Wash down the sides of the beaker, the outer space of the pipet and the watch glass with water and dilute with water to about 100 ml. 6. With stirring the solution, add about 30 ml of disodium ethylenediaminetetraacetate solution from a 50-ml burette. 7. Add 15 ml of sodium hydroxide TS and 300 mg of hydroxy naphthol blue indicator. The adilion of the indicator will turn the colorless solution to a dark purple color. 8. Continue the titration with the disodium EDTA solution to a distinct blue end point. 9. Record the data of the first trial, then conduct two more trials. Data and Results T1 T2 T3 Added volume of titrant 6.4 ml 5.7 ml 6.9 ml Final volume of titrant Weight of analyte Computed Molarity (M)
Chapter5: Errors In Chemical Analyses
Section: Chapter Questions
Problem 5.10QAP
Related questions
Question
1.How many grams of disodium EDTA is needed to prepare a 350mL solution?
2.What is the molecular weight of the analyte?
Use the probable atomic weights: H=1; C=12; O=16; Ca=40; Na=23; S=28
3.What is the weight in grams of the analyte in T3?
4.What is the final volume in liters of the titrant in T3?
Present the COMPLETE answer for this item. Your answer here will be used for the next item/s.
5.What is the computed molarity for T3?
6.What is the average molarity if T1 = 0.067 M and T2 = 0.058 M?
7.Complete the statement : Each mL of 0.05 M disodium EDTA consumed is equivalent to __________ of CaCO₃.
Transcribed Image Text:Preparation and Standardization of 0.05 M Disodium Ethylenediaminetetraacetate
(EDTA)
Preparation: (prepare 1/2 formulation)
1. Dissolve 18.6 g of disodium ethylenediaminetetraacetate in 1000 ml water.
Standardization: (prepare whole formulation, perform three trials)
1. Weigh accurately about 200 mg of chelometric standard calcium carbonate.
2. Transfer to a 400-ml beaker, add 10 ml of water and swirl to form a slurry.
3. Cover the beaker with a watch glass and introduce 2 ml of diluted hydrochloric acid from a
pipet inserted between the lip of the beaker and the edge of the watch glass.
4. Swirl the contents of the beaker to dissolve the calcium carbonate.
5. Wash down the sides of the beaker, the outer space of the pipet and the watch glass with water
and dilute with water to about 100 ml.
6. With stirring the solution, add about 30 ml of disodium ethylenediaminetetraacetate solution
from a 50-ml burette.
7. Add 15 ml of sodium hydroxide TS and 300 mg of hydroxy naphthol blue indicator. The adilion
of the indicator will turn the colorless solution to a dark purple color.
8. Continue the titration with the disodium EDTA solution to a distinct blue end point.
9. Record the data of the first trial, then conduct two more trials.
Data and Results
T1
T2
T3
Added volume of titrant
6.4 ml
5.7 ml
6.9 ml
Final volume of titrant
Weight of analyte
Computed Molarity (M)
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