Organic Chem Lab Questions?

Posted on 2017-04-27 18:32:00 in Chemistry by NELIE

1. Why must the diazonium salt be added to a cold solution of 2-naphthol (for Orange II) when the same diazonium salt can be added to a room temperature solution of N,N-dimethylaniline (for Methyl Orange)? 

3. Methyl Orange can be used as an acid/base indicator-while its acid-stable form (pHË‚3.2) is red, its alkali stable form (pH˃4.4) is yellow. The color change is due to transition from one chromophore (azo group) to another (quinoid system). Using curvy-arrow notation, draw a mechanism showing how the yellow form is converted to the red form in the presences of acid: 

4. What can you conclude about the association between dye and fabric on the basis of molecular structure (i.e. what is it about the chemical structure of the dye and the fabric that mak dying effective)? Briefly compare and contract the effectiveness of dyeing for each dye fabric combination [ Note: You may want to create and refer to a nicely drawn data table to discuss this topic succinctly]

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