Recrystallization

Question 1

The deposition of crystals from a solution

Answer 1

Crystallization

Question 2

A fixed and rigid arrangement of atoms, molecules, or ions

Answer 2

Lattice Structure

Question 3

A common method of purifying organic substances from the traces of foreign substances

Answer 3

Recrystallization

Question 4

Maximum amount of solute that dissolves in each volume of solvent at a given temperature

Answer 4

Solubility

Question 5

This process should be done as rapidly as possible to avoid undesirable premature recrystallization on the funnel.

Answer 5

Hot Gravity Filtration

Question 6

A solvent that shows the desired solubility behavior for the substance to be crystallized.

Answer 6

Recrystallizing Solvent

Question 7

employs a vacuum to hasten the passage of filtrate through the filter paper

Answer 7

Suction Filtration

Question 7

To minimize clogging of the funnel stem during filtration

Answer 7

Short-stemmed funnel

Question 8

To maximize the flow rate during filtration because of its larger surface area.

Answer 8

Fluted Filter Paper

Question 9

also called vacuum filtration

Answer 9

Suction Filtration

Question 10

Each sphere of lattice structure is called a ________ that represents an atom, ion, or molecule

Answer 10

Lattice Point

Question 11

what is the formula for solubility?

Answer 11

unit: grams of solute/mL of solvent

Question 12

little (sparingly soluble) or no solids dissolved

Answer 12

Insoluble

Question 13

all solids dissolved

Answer 13

Soluble

Question 14

Heat about ____ in a 250mL beaker.

Answer 14

100 mL of water

Question 14

what is the formula for percent recovery?

Answer 14

mass of recrystallized solid divided by mass of crude sample x 100

Question 15

Dissolve the ________ in 30 mL of water in a clamped 125 mL Erlenmeyer flask.

Answer 15

impure acetanilide

Question 16

TRUE OR FALSE

Recrystallization is a common method of purifying organic substances from the traces of foreign substances by taking advantage of:
a. the difference in solubility at different temperature.
b. tendency of a growing crystal to exclude anything that does not fit into its lattice

Answer 16

TRUE

Question 17

TRUE OR FALSE

Repeating unit cells forms the “lattice structure” of a crystalline solid

Answer 17

TRUE

Question 18

TRUE OR FALSE

Prepare hot water bath inside the fume hood using the 150 mL beaker. Half fill the beaker with distilled water. Turn the temperature setting of the hot plate to 150C.

Answer 18

TRUE