Choose the group that causes solubility of dyes in acid:
Correct answer: B. -NR₂
- A. -OH
- B. -NR₂
- C. -SO₃H
- D. -COOH
Explanation
Basic groups, such as the amino group (-NH₂) or a substituted amino group (-NR₂), can be protonated in an acidic solution. This forms a positively charged ammonium salt, which greatly increases the dye's solubility in the aqueous acid.
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About Industrial Chemistry
Industrial chemistry applies chemical reactions and material properties to the manufacture of adhesives, dyes and polymers. Coverage includes addition and condensation polymerisation, thermoplastics and thermosetting polymers, the structural basis of colour in dyes, and how adhesive composition enables bonding between surfaces.
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