ochem lab unit 10

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how was HBR provided

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24 Terms

1

how was HBR provided

prepared in flask (in situ)

  • NaBr +

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2

purpose of adding water to RBV after reflux

to prevent sudden crystalization

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3

effect of no pet ether during extractions

inversion of layers could occur

  • organic layer at bottom not distinct

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4

purpose of cooling to room temp before adding pet ether

pet ether has low boiling components => net to cool to prevent evaporation

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5

purpose of aq sodium bicarbonate as extraction

to neutralize residual acid

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6

purpose of adding anhydrous magnesium sulfate

drying agent => forms clumps/crystals

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7

purpose of hot waste bath after anhydrous magnesium sulfate

to obtain heat liquid product

  • used for percent yield and IR analysis

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8

molarity

moles/volume (L)

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9

TLC "less polar" spot

travels farther since it does not interact with stationary phase

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10

retention factor

distance traveled by spot/distance traveled by solvent from

  • ALWAYS <1

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11

TLC mobile phase

non polar, liquid

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12

TLC stationary phase

polar, liquid or solid

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13

constant mass can be used to calculate

actual and percent yield

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14

solid phase

25°

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15

liquid phase

< 25°

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16

soluble in water

polar

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17

(?) x^n in water

slightly polar

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18

insoluble in water

non polar

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19

SN1 only

carbocation intermediates

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20

SN2 only

transition state

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21

both SN1 and SN2

nucleophilic substitutes

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22

gas chromatography used to determine

  • percent composition

  • sample purity

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23

common drying agent to remove water

sodium sulfate

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24

t-butyl chloride made by SN1 or SN2 reaction

SN1

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