Unknown Analysis Anions

Question 1

(+) 2 drops of Ba(NO3)2 = white ppt: ____, ____, ____

Answer 1

CO3 (Carbonate)
PO4 (Phosphate)
SO4 (Sulfate)

Question 2

(+) 2 drops of Ba(NO3)2 = nvr: ____, ____, ____, ____

Answer 2

I (Iodine)
Br (Bromine)
SCN (Thiocyanate)
NO3 (Nitrate)

Question 3

White ppt: decant and add _______

Answer 3

CH3COOH (Acetic Acid)

Question 4

CH3COOH (Acetic Acid) + white ppt = dissolve w/ gas: _____

Answer 4

CO3

Question 5

CH3COOH (Acetic Acid) + white ppt = dissolve w/o gas: _____

Answer 5

PO4

Question 6

CH3COOH (Acetic Acid) + white ppt = does not dissolve: _____

Answer 6

SO4

Question 7

(+) 2 drops HNO3
(+) 3 drops Fe(NO3)3
(+) 5 drops toluene
= no visible reaction

Answer 7

Br (Bromine)

NO3 (Nitrate)

Question 8

(+) 2 drops HNO3
(+) 3 drops Fe(NO3)3
(+) 5 drops toluene
= red aqueous solution

Answer 8

SCN (Thiocyanate)

Question 9

(+) 2 drops HNO3
(+) 3 drops Fe(NO3)3
(+) 5 drops toluene
= pink toluene layer

Answer 9

I (Iodine)

Question 10

Confirmatory test for Br:

Answer 10

(+) 2 drops HNO3
(+) 1 drop KMnO4
(+) 5 drops toluene

Question 11

(+) 2 drops HNO3
(+) 1 drop KMnO4
(+) 5 drops toluene
= yellow/ orange toluene

Answer 11

Bromine indeed!

Question 12

(+) 2 drops HNO3
(+) 1 drop KMnO4
(+) 5 drops toluene
= no visible reaction

Answer 12

Test for NO3

Question 13

Confirmatory Test for NO3

Answer 13

(+) 2 drops 6 M H2SO4
(+) 6 drops FeSO4
- MIX. TILT 60 
(+) 4 drops 18 M H2SO4
- SLOWLY TILT UPRIGHT

Question 14

(+) 2 drops 6 M H2SO4
(+) 6 drops FeSO4
(+) 4 drops 18 M H2SO4
= brown ring

Answer 14

NO3