Salt analysis 4

Question 1

CONFIRMATIVE TEST for Test for Carbonate

Answer 1

1. Add dil. HCl to the salt solution. Heat it.
2. Brisk effervescence of a colourless and odourless gas evolves. Pass this gas through limewater, it turns milky.
   3, CO32-
   Confirmed

Question 2

confirmative test for halogen

Answer 2

1. Salt + water. Add AgNO3
   a. White ppt soluble in NH4OH : Cl- confirmed
   b. Pale yellow ppt partially soluble in NH4OH : Br- confirmed
   c. Yellow ppt insoluble in NH40H : I- confirmed

Question 3

CHROMYL
CHLORIDE TEST-

Answer 3

1. Mix a little salt with K2Cr2O7 and conc. H2SO4. Heat it.

Pass the red vapors through NaOH.

Add Acetic acid and lead acetate

2. Red vapours

Yellow color

Yellow ppt
Cl- confirmed

3. Reddish brown layer : Br- confirmed

Question 4

Test for Acetate

Answer 4

1. Dissolve a little salt in
   Water and add neutral
   FeCl3. Dilute the above solution and boil.
2. Brown solution : CH3COO confirmed

Reddish brown ppt : CH3COO- confirmed

Question 5

Test for Sulphide

Answer 5

1. Salt + water. Heat and add lead acetate.
2. Black ppt : S2- confirmed

Question 6

Test for Nitrate

Answer 6

1. Salt +water. Add freshly prepared FeSO4 solution and con H2SO4 through the side of test tube.
2. Brown ring formed at the junction of two liquids : NO3- Confirmed

Question 7

Test for Phosphate presence

Answer 7

1. Salt + water. Add conc. HNO3 and ammonium
   molybdate and heat the contents.
   Canary yellow color or ppt. : PO4 3-

Question 8

Test for Phosphate confirmation

Answer 8

Salt + water. Add NH4OH and CaCl2.
A White ppt soluble in dil. HCl or dil. HNO3 : PO43- confirmed

Question 9

Test for sulphate presence

Answer 9

Salt + water. Add BaCl2.
White ppt insoluble in dil. HCl and dil. HNO3
SO42- present

Question 10

test for sulphate confirmation

Answer 10

Salt + water. Add lead acetate.
White ppt insoluble in dil. HCl but soluble in ammonium acetate solution : So4 2- confirmed