Answer to Question #291941 in Organic Chemistry for thomas

Question

3. If iron filings were an impurity present along with the ASA in this

experiment, at which point in the recrystallization procedure would they

be removed completely from the ASA? (What slide numbers show this

procedure?)

4. What is the purpose of adjusting the polarity in slide 19 of the slide

presentation?

5. Would benzoic acid dissolve better in water, or in ethanol? Explain why

using the concepts discussed in this laboratory.

Answer 1

Answer 5-

Benzoic acid is purified by recrystallization from water. This is because of its high solubility in hot water and poor solubility in cold water. This process usually gives a yield of around 65 per cent of benzoic acid.

By hydrolysis

On hydrolysis of benzonitrile and benzamide, it converts into benzoic acid. It can also convert into its conjugate base in acid or basic conditions

Questions 3 and 4 required slide 19 then I can give you answer.