Lab 11

Experiment 11 Lab Assignment Answer shroud:
Chromatography of Food Dyes
Name:
Pre-Lab:
Define the Rf value of a compound
The rf value is the withdrawnness the compound moves relative to the distance the
solvent moves.

Data and Observations:
Record the distance travelled by the sample and the solvent in the table below
and calculate the Rf values.

Table 1.
Color
Distance(m

luscious1

blue sky2

Red3

Red40

colour5

Yellow6

33

3

10

22

42

30

.55

.05

.17

.37

.70

.50

m)
Rf

Solvent
60

Table 2.
Kool-Aid®: grape vine

Kool-Aid®: Strawberry

Distance (mm)

Red: 5

10

Distance (mm)

Blue:17

n/a

Rf

.08 and .28

.17

Substance

Solvent
60

Table 3.
Substance
Distance

McK Red

McK Yellow

McK Green

McK Blue

Solvent

51

60

Yellow-50

Red-33

80

Blue-72

Blue-70

80

.63 and .90

.41 and .88

(mm)

Distance
(mm)
Rf

.64

.75

Table 4.
Substance

M&M

M&M

M&M

M&M

Green

Yellow

Blue

Red

Distance (mm)

8

30

50

10

Rf

.10

.38

.63

Solvent

.13

A.





80

The FD&C color(s) making up the unbeknownst(predicate) =
Blue #1, Red #40, Yellow #42

B.

Brand name of the FD&C color(s) from the grocery store food =

Blue #1, Red #40

C.

The FD&C color(s) making up the grocery store food colorings =
McKormicks- Yellow #42, Blue #1, Red #40

D.

The FD&C color(s) making up the Kool-Aid drinks. =

Grape= Red #3 and Blue #1, Strawberry= Red #3

E.

The FD&C color(s) making up the M&Ms®. =

Blue #1, Yellow #6, Red #3,

Post-Lab Questions:
1. wherefore cant a pen be utilise to draw the baseline on the chromatography musical theme?
Because the ink would separate.

2. Why is it all-important(a) to stop the chromatograph before the solvent reaches the top of
the paper ?
Without knowing where the solvent reaches the top, you can not calculate the Rf.

3.Why is it important to keep the dye spots above the...If you want to deject a full essay, order it on our website: Orderessay



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