Saturday

December 20, 2014

December 20, 2014

Posted by **Katy** on Thursday, September 29, 2011 at 1:18am.

The solubility of a certain compound in ice-cold water is 0.18g in 100 mL. Its solubility in hot water is 2.35g in 100 mL. What is the best possible percent recovery we can expect for recrystallization of this compound from water?

- Chemistry -
**DrBob222**, Thursday, September 29, 2011 at 1:39amYou don't have enough information posted to work the problem. Here is what you do.

Look at your procedure and calculate the grams of product you expect to make assuming 100% for the reaction. Then multiply 0.18 x (volume you expect/100) and subtract from the product you expect to have. Finally, the amount left/amount expectedt)*100 = maximum recovery you can expect. You won't get that because the reaction won't be 100%. The idea is that if the solubility is 0.18 g/100 mL, you will lose that much per 100 mL during recrystallization (if just one recryst is done). If you expect to recrystallize more than once, you will lose that much each time.

- Chemistry -
**DrBob222**, Thursday, September 29, 2011 at 3:39pmI've had second thoughts about this. Although I think my initial response is correct, I believe we can approach it another way much simpler.

If we take a 2.35g sample, we can dissolve it in 100 mL water. If we then crystallize it at ice cold temperature, 0.18g of it will be lost. So the amount recovered is 2.35-0.18 =2.17g

%recovery = (2.17/2.35)*100 = x or about 92%

**Answer this Question**

**Related Questions**

organic Chemistry - In my Organic chemistry lab, the calculated enantiomeric ...

Math - If you pass general chemistry, then you can take organic chemistry. You ...

Chemistry - I have to write the exact lewis electron dot structure for para ...

MATH - a library shelf is 9 ft wide. a set of books fills 1/6 of the shelf space...

Reading - Rosalind Wiseman books Terra Elan McVoy books Susane Colasanti books ...

math - lizette wants to read more books. her goal is to read at least 2 books ...

algerbra - Keisha read twice as many books this year as ben read. subtracting 4 ...

Chemistry - Tell me a website from where i can get full information regarding ...

Augmented Matrix - can someone please help me solve this question? I tried so ...

Augmented Matrix - can someone please help me solve this question? I tried so ...