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Structure and Preparation of Methyl Orange from sulfanilic acid in the presence of NaCl, Na2CO3, NaNO2 which work as a catalyst
Typology: Lab Reports
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3
3
Figure 17. 1 Structure of Methyl Orange
3
3
O
yellow, pH > 4. 4
3
3
methyl orange
red, pH < 3. 1
(inner salt form)
2
3
3
3
3
Cl
Figure 17. 2 Preparation of Methyl Orange
sulfanilic acid
3
NaNO 2
HCl
methyl orange
Na
O
2
N O H-Cl
2
2
Na
O S N
HCl
H Cl
Na
O
H-Cl
Cl
S N
H-Cl
2
3
N
3
3
3
3
2
3
3
3
sulfanilic acid
Nitroso ion formation
Figure 17. 3 Mechanism for Methyl Orange Formation
Diazonium salt
nitroso ion
We neutralize the protonated dimethylaniline
to make it into a good nucelophile.