Chemistry 101Chemistry 101Set-up forSet-up for

DISTILLATIONSDISTILLATIONSCollecting theCollecting the

fermentation mixturefermentation mixture

From the From the side-side-

bench, bench, obtain the obtain the following following five items five items

ofof standard standard

taper taper glasswareglassware

Apply a Apply a thin thin

coating of coating of “stopcock “stopcock grease”grease” to to

the the ground ground glass glass joints.joints.

Start setting Start setting up with a up with a

suitable ring suitable ring stand. stand.

(Tighten the (Tighten the rod!)rod!)

Place the Place the burner on burner on the ring the ring stand.stand.

Then, add Then, add the iron ring,the iron ring, leaving 2 to 3 leaving 2 to 3

inches for inches for the flame.the flame.

The wire The wire gauze rests gauze rests on top of the on top of the

iron ring.iron ring.

Carefully, Carefully, without without

disturbing disturbing the sediment, the sediment,

decant the decant the clear clear

supernatant supernatant liquid into the liquid into the

RB flask.RB flask.

The RB flask The RB flask is clamped is clamped

directly onto directly onto the wire the wire gauze. gauze.

Leave Leave NONO air air space.space.

The 3-way The 3-way adapter adapter (still (still

head)head) is is inserted into inserted into the RB flaskthe RB flask.

A thermometer A thermometer is fitted is fitted

through the through the rubber holder rubber holder ANDAND the glass the glass

adapter.adapter.

The The thermometer thermometer assembly is assembly is inserted into inserted into

the still head. the still head. The The

thermometer thermometer bulb should be bulb should be just below the just below the

side-arm.side-arm.

The attached The attached condenser is condenser is

secured to secured to another ring another ring

stand.stand. Water enters Water enters

the the lowerlower end.end.

A graduated A graduated cylinder in cylinder in

an ice-water an ice-water slurry serves slurry serves

as the as the receiver.receiver.

It would be It would be wise to wise to

weigh the weigh the cylinder cylinder FIRST!FIRST!

Have your Have your instructor instructor

check check your set-your set-up before up before you begin you begin distilling.distilling.

With a With a smallsmall

flame, flame, distill the distill the mixture, mixture,

collecting collecting about 10 about 10 mLs of mLs of

distillate.distillate.

Determining the proof Determining the proof graphically.graphically.

Light a few drops on a watch glass.Light a few drops on a watch glass.

LOOK CLOSELY!!LOOK CLOSELY!!

The pale blue flame is difficult to seeThe pale blue flame is difficult to see.

Finally, CLEAN UP!Finally, CLEAN UP!

Clean and return the S/T glassware to their Clean and return the S/T glassware to their respective boxes. Clean the Erlenmeyer flask, respective boxes. Clean the Erlenmeyer flask, testtube, and connecting assembly and return testtube, and connecting assembly and return

them to their respective places.them to their respective places.