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12 questions from this quiz
C6H5COOH\mathrm{C_6H_5COOH}C6H5COOH
E211
Potassium permanganate
Purple to brown
Sodium benzoate
To convert sodium benzoate to benzoic acid
Different solubilities at different temperatures
Remove insoluble impurities
To maximize crystal yield upon cooling
121-122°C
Lower melting point and wider range
90%
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