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3. Suggest a qualitative test (based on solubility) that would differentiate a pure acidic organic compound from a neutral organic compound. Indicate clearly how the test would be done: steps to be taken, what result would be expected for an acidic compound vs. a neutral compounds. Hint: lab 2 contained a series of qualitative tests. Qualitative solubility tests give different (visible) results for different types of compounds. Complete on a separate page, please
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Answer #1

Take Benzoic acid and Benzaldehyde

(1) Benzoic acid is initially insoluble in water. When NaOH, a strong base is added to benzoic acid it forms a soluble salt i.e sodium benzoate. This is due to acidic nature of benzoic acid.

C6H5COOH (s) + NaOH (aq.) --------> C6H5COONa (aq.) + H2O (l)

insoluble                                             soluble

(2) Benzaldehyde is insoluble in water. When NaOH is added no change is observed which indicates no acidic nature for benzaldehyde.

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