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When you dissolve p-aminobenzoic acid in ethanol and then add sulfuric acid. Once the sulfuric acid is dissolved a white solid will likely precipitate out. Draw the structure of this white solid compound.
Accepted Answer
The white solid that precipitates out is the p-aminobenzoic acid sulfate salt. Here's the structure:
[Structure of p-aminobenzoic acid sulfate salt]
Here's why this happens:
Protonation: Sulfuric acid is a strong acid, and it protonates the amine group (-NH2) of p-aminobenzoic acid, creating a positively charged ammonium ion (-NH3+).
Ionic Interaction: The positively charged ammonium ion now interacts strongly with the negatively charged sulfate ion (SO42-) from the sulfuric acid.
Insolubility: This ionic interaction forms a salt that is less soluble in ethanol than the original p-aminobenzoic acid, leading to its precipitation.
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