carbs "color observations" (lab)

Question 1

(Iodine Test)
starch

Answer 1

deep blue color +

Question 2

(Iodine Test) dextrin

Answer 2

violet +

Question 3

(Iodine Test) gum arabic

Answer 3

no blue or red-brown color +

Question 4

(Iodine Test) agar-agar

Answer 4

dark brown color +

Question 5

(Iodine Test) none

Answer 5

yellow color -

Question 6

(Fehling’s Test) glu gal fruc mal lac

Answer 6

brick red precipitate +

Question 7

(Fehling’s Test) sucrose

Answer 7

blue solution -

Question 8

(Benedict’s Test) glucose, fructose, maltose, lactose, galactose

Answer 8

brick red precipitate +

Question 9

(Benedict’s Test) sucrose, starch

Answer 9

blue solution -

Question 10

(Benedict’s Test) Ethanaldehyde

Answer 10

brick red precipitate +

Question 11

(Benedict’s Test) Benzaldehyde (non-aliphatic aldehyde)

Answer 11

blue solution -

Question 12

(Barfoed’s Test) glucose, fructose, galactose

Answer 12

brick red precipitate +

Question 13

(Barfoed’s Test) maltose, sucrose, and lactose

Answer 13

blue solution -

Question 14

(Picric Acid Test) glucose, fructose, maltose, lactose, galactose

Answer 14

mahogany red color +

Question 15

(Picric Acid Test) sucrose, starch

Answer 15

yellow -

Question 16

(Seliwanoff’s Test) sucrose and fructose

Answer 16

red/cherry red color +

Question 17

(Seliwanoff’s Test) galactose, lactose, glucose and maltose

Answer 17

yellow -

Question 18

(Moore’s Test) glucose, galactose, fructose, lactose, maltose, starch

Answer 18

brown color with caramel like odor +

Question 19

(Moore’s Test) sucrose

Answer 19

colorless -

Question 20

(Molisch’s Test) all

Answer 20

formation of a purple/red ring +

Question 21

(Molisch’s Test) colorless -

Answer 21

none

Question 22

(Trommer’s Test) glucose, maltose, fructose, sucrose, lactose, galactose

Answer 22

brick red precipitate +

Question 23

(Mucic Test) galactose (sandy) and lactose (flaky)

Answer 23

crystal formation (precipitate) +

Question 24

(Mucic Test) glucose, frucgtose, sucrose, maltose

Answer 24

no crystal formation -

Question 25

(Bial’s Test) ribose

Answer 25

blue to green solution +

Question 26

(Bial’s Test) glucose, fructose, galactose, sucrose, maltose, lactose

Answer 26

otherwise -

Question 27

(Anthrone Test) all

Answer 27

bluish-green complex +

Question 28

(Anthrone Test) none

Answer 28

colorless -

Question 29

(Nylander’s Test) glucose, fructose, galactose, maltose, lactose

Answer 29

dark brown to black precipitate +

Question 30

(Nylander’s Test) sucrose

Answer 30

no reaction -