Wednesday
August 27, 2014

Homework Help: chemistry

Posted by Anonymous on Monday, October 26, 2009 at 11:40am.

you extract 10 g of benzoic acid from an ether solution with aqueous NaHCO3

what is the min amount of concentrated HCl (37% by w/v%) that would be needed to convert the sodium benzoat back to free energy? (answer: 8.2 mL)
I know that the 37% is basically 37g/ 100ml but how would that help me?

How many extractions do you need in order to extract at least 95% of the benzoic acid with 15mL of methylene chloride (solvent 2) that are intially presented in 45mL of HCl (solvent 1)? You may assume that the partition coefficient to be 3.5 for the benzoic acid.(answer is 4)
I did something wrong!
10=9.5(45ml/[3.5*15 + 45])^n
solving for n and I don't get 4

Thanks for the help!

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

Organic Chemistry - Extraction - You have 100 mL of a solution of benzoic acid ...
Chemistry - An etheral solution contains benzoic acid, 9-fluorenone, abd ethyl 4...
Org. Chem. - what is the precipitate formed when HCl is added? I believe the ...
chemistry - Please help. Concentrated hydrochloric acid is a 38% w/w solution of...
university chemistry - this is for a chemistry laboratory experiment called "how...
OChem - A mixture of fluorene and benzoic acid is dissolved in diethyl ether and...
Pharmacy math - concentrated hydrochloric acid is a 38% solution of hcl in water...
Chemistry - You have 150 ml of a solution of benzoic acid in water estimated to ...
Chemistry - You have 150 ml of a solution of benzoic acid in water estimated to ...
Chemistry - A solution is prepared by adding 47.3 mL of concentrated ...

Search
Members