Qualitative analysis 3 Flashcards
1
Q
Biuret test reagent
A
Alkaline CuSO4
We get violet color
2
Q
Ninhydrin test reagent
A
search for ninhydrin structure
we get purple color)(Rhumann’s purple
3
Q
Xanthoproteic test reagent
A
conc. HNO3
we get yellow color
4
Q
CrO42- + H2O2 + H+ —->
A
CrO5(blue)
5
Q
1 naphthyl amine
A
two benzene rings, one of them has NH2 grp at ortho position of attachment
6
Q
where does diazotization of 1 naphthyl amine happen
A
At para position of of NH2 of the napthyl amine
7
Q
Turning potassium dichromate paper green
A
K2Cr2O7 + H2SO4 + SO2 ——> Cr2(SO4)3 + H2O + K2SO4
8
Q
HNO2 ——>
A
HNO3 + NO + H2O
9
Q
Cl- + MnO2 + H2SO4
A
Cl2 + MnSO4+ Na2SO4 + H2O
