Lab Assessment_Solvent Extraction

Define distribution coefficient

• Concentration of solute in aqueous phase divide with concentration of solute in organic phase

• Concentration of solute in organic phase divide with volume of aqueous phase

• Concentration of solute in organic phase divide with concentration of solute in aqueous phase

• Concentration of solute in aqueous phase divide with volume of organic phase

What is the organic phase use in the Solvent Extraction of Zn (II) experiment?

• EDTA solution

• Ammonium chloride

• hydrochloric acid

• toluene-TBP

What is the purpose of back extraction in the experiment?

• To extract the Zn into aqueous phase for titration

• To allow the Zn ion to form metal complex

• To ensure the organic phase is clean from impurities

• To remove the Zn from the aqueous phase

What is the chelating agent used for the complexation with Zn (II) ion? What type of ligand is the chelating agent?

• EDTA - bidentate ligand

• EDTA - hexadentate

• Citric acid - hexadentate

• Citric acid - bidentate

In solvent extraction experiment, what is the purpose of shaking the Zn solution with the mixture of organic solvent?

• To allow contact between Zn and the organic compound

• To transform the Zn ion into a neutral species

• To transfer Zn ion into the organic phase

• To separate the Zn from other impurities