You work in a small scale manufacturing facility that uses phthalic acid as the

Question

You work in a small scale manufacturing facility that uses phthalic acid as the starting material for a multi-step synthesis. Your company buys ~98% pure phthalic acid from a major manufacturer and purifies it in-house prior to its use in the multi-step synthesis. You are given the job to purify 100g of the impure phthalic acid by recrystallization from water. Approximately how much water will you need to use to prepare the hot saturated? Upon cooling in an ice-bath and subsequent filtration, how much pure phthalic acid would you expect to recover? show calculations

Explanation / Answer

Take phthalic acid 100g and add water a measured quantity and heat it to soluble, if it is not soluble add some more water and heat to soluble completely and cool the hot solution in ice bath, the solid material formed can be filtered. First time you can get around 80% of pure phthalic acid, cooling for long time will deliver remaining pure material

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