A solid compound dissolves readily in water to give a weakly alkaline solution. On evaporation of the water, X was recovered unchanged. Which one of the following could be X?
Correct answer: C. C6H5 O-Na+
- A. CH3 NH3 Cl
- B. CH3 O- Na+
- C. C6H5 O-Na+
- D. C6H5NH2
- E. H2NCH2CO2H
Explanation
The sodium salt of phenol, which is weakly acidic. When dissolved in water, it would give a weakly alkaline solution due to the hydrolysis of the phenoxide ion. On evaporation, we would recover the original compound unchanged.
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About Salts and Hydrolysis
Salt hydrolysis explains how ions from weak acids or weak bases react with water and affect the pH of a solution. The content covers acidic, basic and neutral salts, hydrolysis equations, Ka, Kb and Kw relationships, degree of hydrolysis and buffer connections, distinguishing hydrolysis from simple acid-base neutralisation.
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