Chemical Forums
Chemistry Forums for Students => Organic Chemistry Forum => Topic started by: topenator on February 18, 2020, 07:51:37 AM
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I am required to make my organic sample a picrate by using saturated picric acid in water. What other chemicals can I use to make my sample a crystal/salt?
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Oxalic acid is good for amines sometimes. It can be used as solution in ether.
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Picric acid is a problem.
Can you give us other information - what is the type and purpose of the sample? What is it that is "requiring" you to make the picrate?
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I have a yam tuber sample which I freeze-dried and macerated with 95% ethanol, then I concentrated it using a rotary evaporator and dissolving in 5% acetic acid. Then, I got an acid supernatant which I filtered and made alkaline by using ammonium hydroxide then extracting it with DCM using a separatory funnel. I used the rotary evaporator again by using the combined DCM extract and used a small amount of absolute ethanol. Then I was supposed to use a saturated picric acid in water to form a picrate but for reasons (explosive, I am an undergrad. student) it is not available. I am trying to purify my sample (which is an alkaloid) which is why I'm trying to find alternative chemicals to form a salt/crystal just like what a picric acid can do which will not affect my sample as i imagine.