Salt Analysis

Question 1

State the aim of the experiment

Answer 1

To identify the anion and cation present in the given salt systematically

Question 2

If color of sample is blue, which ion is present

Answer 2

Cu2+ ions

Question 3

If the color of sample is green, which ion is present

Answer 3

Cu2+ or Ni2+

Question 4

I color of salt is brown, what is the ion

Answer 4

Fe3+ or Mn(NO3)2

Question 5

Light pink sample then what ion

Answer 5

Mn2+ ion

Question 6

How to perform flame test

Answer 6

A thick paste of the sample is prepared using con.HCL and is shown to the non luminous part of the bunsen flam using a glass rod.

Question 7

If livid blue flame, what ion

Answer 7

Pb2+

Question 8

If green edged blue flam, what ion

Answer 8

Cu2+

Question 9

If Crimson flame, what ion

Answer 9

Sr2+

Question 10

If pale green flame, what ion

Answer 10

Ba2+

Question 11

If brick red flame, what ion

Answer 11

Ca2+

Question 12

What is the test for CO3- ion
(observation as well)

Answer 12

Solid sample is treated with dil.HCl.
observation- Colorless gas evolved with brisk effervesence.

Question 13

What is the test for Cl- ion
(observation as well)

Answer 13

Solid sample is treated with con.h2so4
observation- WHite fuming pungent smelling gas which produced dense white fumes when NH4OH is shown the mouth of the test tube.

Question 14

What is the test for NO3- (observation as well)

Answer 14

Solid sample + con.h2so4 and heated with copper turnings.
observation- reddish brown gas evolved

Question 15

What is the test for SO4- (observation as well)

Answer 15

Sample solution +dil.HCl followed by Bacl2.
observation- White precipitate of BaSO4 insoluble in con.HCl.

Question 16

What is the confirmatory test for CO3- (observation as well)

Answer 16

Gas evolved passed through lime water.
observation- lime water turns milky

Question 17

Confirmatory test for Cl-
(observation as well)

Answer 17

Sample solution + dil.HNO3 followed by Agno3 solution.
observation- thick white curd like precipitate
(AgCl) which dissolves is excess of NH4OH

Question 18

Confirmatory test for SO4-

Answer 18

Sample solution + dil. acetic acid +lead acetate
observation- White precipitate PbSO4 soluble in Ammonium acetate.

Question 19

Confirmatory test for NO3-
(observation as well)

Answer 19

Sample solution +dil.H2SO4 + Freshly prepared FeSO4 solution and agitate mixture well. Then and con.H2SO4 drop wise.
observation- Thin dark brown ring is formed at the junction of the mixture and H2SO4

Question 20

Test for NH4- ion
( observation as well

Answer 20

Solid sample + NaOH and note smell. Smell of ammonia which produces dense white fumes when con.HCl is shown to the mouth of the test tube.

Question 21

Confirmatory test for NH4- ion
( observation as well )

Answer 21

Solid sample + NaOH + Nesselr’s reagent.
Brown precipitate is formed.

Question 22

Test for presence of group I cation
( observation as well )

Answer 22

Sample solution + dil.HCl. White precipitate of PbCl2.

Question 23

Test for Presence of group II cation
( observation as well )

Answer 23

H2S gas passed through group I solution.

Question 24

Test for presence of group III cation
( observation as well )

Answer 24

Sample solution + NH4Cl + NH4OH
observation- Gelatinous white ppt of Al(OH)3 or Brown ppt of Fe(OH)3

Question 25

Test for presence of group IV cation
( observation as well )

Answer 25

Group IV solution +H2S gas.
observation- Dirty white ppt of Z2S
Buff ppt of MnS
Black ppt of NiS

Question 26

Test for group V cation
( observation as well )

Answer 26

(NH4)2CO3 + group III solution.
observation- White ppt of BaCO3, SrCO3, or CaCo3

Question 27

Test for Mg+ ( group VI )
( observation as well )

Answer 27

Group III solution +dihydrogen sodium
observation- White crytalline ppt of Magnesium phosphate

Question 28

Confirmatory test for Mg+(group VI)
( observation as well )

Answer 28

Sample soltion + Magneson reagent + NaOH
observation- Blue ppt