chem 40 practical

Question 1

WASTE DISPOSAL

insoluble in water

Answer 1

G7O4

Question 2

WASTE DISPOSAL

Br2 with light

Answer 2

G703

Question 3

WASTE DISPOSAL

Baeyer’s Test

Answer 3

E501

Question 4

WASTE DISPOSAL

Tollen’s Test

Answer 4

D499 (Ag)

Question 5

How long will tollen’s test be heated if no reaction?

Answer 5

5 minutes - 10 minutes

dont overheat, pwede mag false positive

Question 6

WATER SOLUBILITY TEST

procedure?

Answer 6

1.) 5 drops of dH2O
2.) 3 drops of sample / pinch of sample

Question 7

WASTE DISPOSAL

Solubility in 10% NaOH

Answer 7

G704

Question 7

WASTE DISPOSAL

Solubility in conc. H2SO4

Answer 7

G704

Question 8

WASTE DISPOSAL

Hot acidic KMnO4

Answer 8

E501

Question 9

WASTE DISPOSAL

FeCl3 Test

Answer 9

D499 (Fe)

Question 10

WASTE DISPOSAL

Iodoform Test

Answer 10

G703

Question 11

WASTE DISPOSAL

2,4 DNP Test

Answer 11

G704

Question 12

WASTE DISPOSAL

Molisch Test

Answer 12

G704

Question 13

WASTE DISPOSAL

Benedicts’ Test

Answer 13

D499 (Cu)

Question 14

WASTE DISPOSAL

Solubility in 10% HCl

Answer 14

G704

Question 15

WASTE DISPOSAL

Ninhydrin

Answer 15

G704

Question 16

WASTE DISPOSAL

Biuret

Answer 16

D499 (Cu)

Question 17

WASTE DISPOSAL

Lead Acetate

Answer 17

D406 (Pb)

Question 18

HARD WATER TEST

• procedure?

Answer 18

1.) 10 drops of 0.02 M CaCl2 / faucet water
2.) 5 drops sample

Question 19

WASTE DISPOSAL

Solubility in 10% NaHCO3

Answer 19

G704

Question 20

WASTE DISPOSAL

Hard Water Test

Answer 20

Sink

Question 21

Br2 WITH LIGHT

• what to use as reagent if there is NO Br2 in CHCl2?

Answer 21

Br2 in H2O

Question 22

EXER 10

• if negative yung sample in a test, do you still have to write it in the exercise?

Answer 22

yes

Question 23

POSITIVE RESULTS FOR CHEMICAL TEST

Br2 with light

Answer 23

loss of color

(usually loss of red-orange color)

Question 24

POSITIVE RESULTS FOR CHEMICAL TEST Baeyer's Test

Answer 24

loss of purple color + formation of brown mixture / ppt

Question 25

POSITIVE RESULTS FOR CHEMICAL TEST hot acidic KMnO4

Answer 25

loss of purple color + formation of brown mixture / ppt

Question 26

POSITIVE RESULTS FOR CHEMICAL TEST Tollen's Test

Answer 26

silver mirror

Question 27

POSITIVE RESULTS FOR CHEMICAL TEST FeCl3 Test

Answer 27

blue, red, purple complex

Question 28

POSITIVE RESULTS FOR CHEMICAL TEST 2,4 DNP Test

Answer 28

yellow to orange ppt/mixture

Question 29

POSITIVE RESULTS FOR CHEMICAL TEST Iodoform Test

Answer 29

light yellow ppt

Question 30

POSITIVE RESULTS FOR CHEMICAL TEST Molisch

Answer 30

presence of red-purple to purple RING

Question 31

POSITIVE RESULTS FOR CHEMICAL TEST Benedict's Test

Answer 31

brick red mixture/ppt

Question 32

SOLUBILITY IN HCl - procedure

Answer 32

1.) 10 drops 10% HCl 2.) dont get new sample 3.) result must be amine

Question 33

POSITIVE RESULTS FOR CHEMICAL TEST Biuret Test

Answer 33

violet complex

Question 34

POSITIVE RESULTS FOR CHEMICAL TEST Ninhydrin test

Answer 34

light violet mixture

Question 35

POSITIVE RESULTS FOR CHEMICAL TEST Lead Acetate Test

Answer 35

Black ppt

Question 36

POSITIVE RESULTS FOR CHEMICAL TEST Hard Water test

Answer 36

formation of ppt (i think white ppt? basta hindi clear)

Question 37

indication of INSOLUBILITY in water?

Answer 37

basta NOT CLEAR insoluble if: - 2 layers - may ppt or turbid na