Salt analysis 3 Flashcards
1
Q
NH4+ present
A
- Heat the given salt with NaOH.
Smell of NH3 - Bring a glass rod dipped in Conc. HCl near a mouth of the test tube.
Dense white fumes evolves
2
Q
NH4+ confirmed
A
- Add Nesslers reagent to the salt solution.
Brown ppt formed
3
Q
CO32-
Present.
A
- Treat the salt with dil. H2SO4 solution
Observation: - - colourless and odourless gas with brisk effervescence evolve
4
Q
S2- present
A
- Treat the salt with dil. H2SO4 solution
Observation: - - Colourless gas with smell of rotten egg turning lead acetate paper black.
5
Q
Cl- present
A
- Treat with con. H2SO4 solution
Observation: - - Colourless gas with pungent smell giving dense white fumes with glass rod dipped in NH40H.
6
Q
Br- present
A
- Treat with con. H2SO4 solution
Observation: - - Reddish brown vapour and solution turns brown
7
Q
I- present
A
- Treat with con. H2SO4 solution
Observation: - - Violet vapour
8
Q
NO3- present
A
- Treat with con. H2SO4 solution
Observation: - - Reddish brown vapour obtained on heating
9
Q
Acetate present
A
- Treat with con. H2SO4 solution
Observation: - - Vinegar smell
10
Q
(2) NO3- present
A
- Treat with con. H2SO4 solution.
Add Cu turning to the above solution(if Nitrate) and heat.
Observation:- - Intense brown vapour evolves and solution turns blue.
