Orgo Lab Quiz 1

Question 1

thing being dissolved

Answer 1

solute

Question 2

liquid in which the solute is dissolved

Answer 2

solvent

Question 3

how to choose a solvent

Answer 3

the solute must be soluble in hot solvent and relatively insoluble in cold solvent

Question 4

impurities must: be — in hot or cold solvent and them removed by —

Answer 4

insoluble

hot filtration

Question 5

impurities must: be — in hot or cold solvent and they say behind in solvent after the product has recrystallized

Answer 5

soluble

Question 6

impurities — mp

Answer 6

decrease

Question 7

2 types of impurities

Answer 7

soluble (get into matrix), insoluble (like sand or charcoal)

Question 8

when trying to purify — we used recrystallization

Answer 8

solids

Question 9

two things we recrystallized

Answer 9

p-dibromobenzene and acetanilide

Question 10

way to tell if a sample is super pure

Answer 10

it melts very quickly, mp range is less than 5 degrees

Question 11

p-dibromobenzene is — so it wants to dissolve in a — compound

Answer 11

nonpolar; orgainc

Question 12

— has enough organic character to dissolve dibromobenzne

Answer 12

ethanol

Question 13

water had to be added in order to force the dibromobenzene out of solution. this is called —

Answer 13

a solvent pair

Question 14

why does adding water force it out of solution?

Answer 14

the solution becomes more polar decreasing the solubility of the dibromo making it come out of solution