Unknown Analysis

Question 1

(Anion) + _ drop of Ba(NO3)2

Answer 1

1

Question 2

(Anion) + 1 drop of ________

Answer 2

Ba(NO3)2

Question 3

(Anion) + 1 drop of Ba(NO3)2 = white ppt: ____, ____, ____

Answer 3

Carbonate CO3 2-
Phospahte PO4 3-
Sulfate SO4 2-

Question 4

(Anion) + 1 drop of Ba(NO3)2 = no ppt: ____, ____, ____, ____

Answer 4

Iodine I-
Bromine Br-
Thiocyanate SCN-
Nitrate NO3-

Question 5

What do I add if no ppt (anion)?

Answer 5

(+) 2 drops 1 M HNO3
(+) 3 drops 0.1 M FE(NO3)3
(+) 5 toluene

Question 6

(+) 2:3:5 ratio
Toluene Layer: colorless
Aqueous Layer: (visible reaction) yellow

Answer 6

Bromine (Br)

Question 7

(+) 2:3:5 ratio
Toluene Layer: pink
Aqueous Layer: pink

Answer 7

Iodine (I)

Question 8

(+) 2:3:5 ratio
Toluene Layer: colorless
Aqueous Layer: blod red complex

Answer 8

Thiocyanate (SCN)

Question 9

(+) 2:3:5 ratio
Toluene Layer: colorless
Aqueous Layer: colorless

Answer 9

NItrate (NO3)

Question 10

What to add which is 1:5 in ratio (anion)?

Answer 10

(+) 1 drop 0.01 M (acidified) KMnO4

(+) 5 drops toluene

Question 11

If KMnO4 is not yet acidified, what do you add?

Answer 11

(+) 2 drops 1 M HNO3

(+) 1 drop KMnO4

Question 12

(+) 1:5 ratio
Toluene Layer: yellow
Aqueous Layer: yellow brown

Answer 12

Bromine (Br)

(+) 1 drop 0.01 M (acidified with HNO3) KMnO4
(+) 5 drops toluene

Question 13

(+) 1:5 ratio
Toluene Layer: pink
Aqueous Layer: yellow brown

Answer 13

Iodine (I)

(+) 1 drop 0.01 M (acidified with HNO3) KMnO4
(+) 5 drops toluene

Question 14

(+) 1:5 ratio
Toluene Layer: colorless
Aqueous Layer: peach

Toluene Layer: colorless
Aqueous Layer: yellow

Answer 14

Thiocyanate (SCN)
Nitrate (NO3)

(+) 1 drop 0.01 M (acidified with HNO3) KMnO4
(+) 5 drops toluene

Question 15

For white ppt anions CO3 2-, PO4 3-, SO4 2-, what do you DO?

Answer 15

Let settle and decant ppt.

Question 16

Once you decant CO3 2-, PO4 3-, SO4 2-, what do you ADD?

Answer 16

1 M Acetic Acid (CH3COOH)

dropwise!

Question 17

(+) 1 M Acetic Acid dropwise: Precipitate dissolves WITH bubbles, then it is _______

Answer 17

CO3 (Carbonate)

Question 18

(+) 1 M Acetic Acid dropwise: Precipitate dissolves WITHOUT bubbles, then it is _______

Answer 18

PO4 (Phosphate)

Question 19

(+) 1 M Acetic Acid dropwise: Precipitate DOES NOT dissolve and white ppt remains, then it is _______

Answer 19

SO4

Question 20

(+) 2:3:5 ratio

Pinkish-red Toluene Layer: _________

Answer 20

Iodine (I)

Question 21

(+) 2:3:5 ratio

Deep Red Aqueous solution: ________

Answer 21

Thiocyanate (SCN)

Question 22

(+) 1:5 ratio

Yellow or orange toluene layer: ________

Answer 22

Bromine (Br)

Question 23

For NO3-, what is the 3:6 ratio?

Answer 23

(+) 3 drops 6 M H2SO4
(+) 6 drops FeSO4
Then, mix!

Question 24

In NO3-, what to do after adding 3:6 and mixing?

Answer 24

Tilt test tube 60 degrees

(+) 3 drops 18 M H2SO4

Question 25

In NO3-, what to do after adding 3:6 and mixing? After ‘Tilt test tube 60 degrees’ and ‘(+) 3 drops 18 M H2SO4’?

Answer 25

DO NOT SHAKE.
Tilt upright SLOWLY.
Observe brown ring.