Solvent Extraction
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Questions and Answers

What is the primary purpose of solvent extraction in organic chemistry?

  • To isolate dissolved compounds from a solution (correct)
  • To synthesize organic compounds
  • To separate a mixture of immiscible solvents
  • To purify inorganic compounds
  • What is the molecular formula of 4-hydroxybenzaldehyde?

  • C8H7O3
  • C5H4O
  • C7H6O2 (correct)
  • C6H5O2
  • What is a characteristic of immiscible solvents?

  • They are insoluble in each other (correct)
  • They are always flammable
  • They are highly toxic
  • They have a high boiling point
  • What is an important consideration when choosing a solvent for extraction?

    <p>That it does not react with the solute or other solvent</p> Signup and view all the answers

    What is the physical appearance of sodium chloride?

    <p>Colorless crystals</p> Signup and view all the answers

    What is a property of diethyl ether?

    <p>It has a low boiling point</p> Signup and view all the answers

    What is the first step in the solvent extraction process?

    <p>Transfer the sample to a separatory funnel</p> Signup and view all the answers

    Why is the stopper removed from the separatory funnel?

    <p>To separate the two layers</p> Signup and view all the answers

    Why is diethyl ether commonly used in extraction despite being flammable?

    <p>It has a high solvating power for hydrocarbons and O-containing compounds</p> Signup and view all the answers

    What is a benefit of using solvent extraction in organic chemistry laboratories?

    <p>It is a convenient alternative to distillation</p> Signup and view all the answers

    What is the purpose of shaking the mixture gently for 15-20 minutes?

    <p>To release pressure from the funnel</p> Signup and view all the answers

    What is a desirable property of a solvent for extraction?

    <p>That it has a low boiling point</p> Signup and view all the answers

    What happens when 4-hydroxybenzaldehyde is heated?

    <p>It sublimes</p> Signup and view all the answers

    What is the purpose of drying the ethereal layer?

    <p>To remove impurities</p> Signup and view all the answers

    What is the purpose of adding a small amount of NaCl to the water layer in solvent extraction?

    <p>To decrease the solubility of the non-polar compound</p> Signup and view all the answers

    What is the partition coefficient in solvent extraction?

    <p>The ratio of the concentrations of a compound in the two phases of a mixture of 2 immiscible liquids at equilibrium</p> Signup and view all the answers

    What is the result of the 'salting out' process in solvent extraction?

    <p>A decrease in the solubility of the non-polar compound</p> Signup and view all the answers

    What is the typical composition of the two solvents in solvent extraction?

    <p>One solvent is organic and the other is aqueous</p> Signup and view all the answers

    Why is diethyl ether used extensively as an extracting solvent?

    <p>Because it is very slightly soluble in water</p> Signup and view all the answers

    What is the purpose of solvent extraction?

    <p>To separate the organic material from the salty aqueous phase</p> Signup and view all the answers

    What is the 'salting out' process used for in solvent extraction?

    <p>To separate the organic material from the salty aqueous phase</p> Signup and view all the answers

    What is the molar mass of sodium chloride?

    <p>58.44 g/mol</p> Signup and view all the answers

    What is the primary characteristic of 4-hydroxybenzaldehyde that allows it to be separated from sodium chloride?

    <p>Solubility in ether</p> Signup and view all the answers

    What is the purpose of leaving the mixture for 5-10 minutes in the solvent extraction process?

    <p>To complete the separation of the two layers</p> Signup and view all the answers

    What is the result of shaking the mixture gently for 15-20 minutes in the solvent extraction process?

    <p>No further pressure is released from the funnel stem</p> Signup and view all the answers

    What is the physical appearance of 4-hydroxybenzaldehyde?

    <p>Yellow-tan powder</p> Signup and view all the answers

    Why is it important to use a separatory funnel in the solvent extraction process?

    <p>To separate the two layers</p> Signup and view all the answers

    What is the molecular formula of sodium chloride?

    <p>NaCl</p> Signup and view all the answers

    What is the purpose of adding 20ml of distilled water to the mixture in the solvent extraction process?

    <p>To decrease the solubility of sodium chloride</p> Signup and view all the answers

    What is the physical state of 4-hydroxybenzaldehyde when it is heated?

    <p>It sublimes</p> Signup and view all the answers

    What is the primary advantage of using ether in the solvent extraction process?

    <p>It is a good solvent for 4-hydroxybenzaldehyde</p> Signup and view all the answers

    4-hydroxybenzaldehyde is a colorless crystal.

    <p>False</p> Signup and view all the answers

    Sodium chloride is slightly soluble in water.

    <p>False</p> Signup and view all the answers

    The mixture is shaken gently for 15-20 minutes to ensure complete separation of the two layers.

    <p>False</p> Signup and view all the answers

    4-hydroxybenzaldehyde is soluble in water.

    <p>False</p> Signup and view all the answers

    The molar mass of 4-hydroxybenzaldehyde is 58.44 g/mol.

    <p>False</p> Signup and view all the answers

    20ml of distilled water is added to the mixture to facilitate the separation of the two layers.

    <p>True</p> Signup and view all the answers

    The ethereal layer is not dried after separation.

    <p>False</p> Signup and view all the answers

    Sodium chloride is an ionic compound.

    <p>True</p> Signup and view all the answers

    The separatory funnel is used to mix the two solvents.

    <p>False</p> Signup and view all the answers

    4-hydroxybenzaldehyde sublimes when heated.

    <p>True</p> Signup and view all the answers

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