Homework Help: chemistry

Posted by Jazmin on Friday, January 21, 2011 at 11:47pm.

A chemical is placed in a beaker containing 20 g of soil and 500 mL of water. At equilibrium, the chemical is found in the soil at a concentration of 100 mg/kg of soil. The equilibrium concentration of this same chemical in the water is 250 痢/L. Calculate the partition coefficient for this chemical on this soil.

chemistry - DrBob222, Saturday, January 22, 2011 at 12:20pm
I don't know what you've been told about the K but it can be written either K for organic layer/water layer or water layer/organic layer. The Ks I have seen USUALLY have been written as K_{organic/aqueous}.
K_o/a = mass organic phase/mass aq phase.
soil phase = organic phase = 100 mg/kg which is 100E-3g/1000g which is 0.0001 g/g. The problem states a 20 g soil sample was used; therefore, 0.0001*20 = 0.002 g chemical A in the soil (organic phase). For water, it is 250 ug/L which is 250E-6g/L and we took a 500 mL sample; therefore, chemical A in the water is 250E-6*0.5L = 0.000125 g. So K_o/a = 0.002/0.000125.
Check my work. Check my thinking.

Answer this Question

Related Questions

chemistry - valerie placed 1.0g of salt into one beaker, 1.0g of soil into a ...
biology - I have some questions that relate to table 2.1 which lists the ...
Physics - A 500 g glass beaker is in thermal equilibrium with 100 ml of 20 ...
Chemistry - If a silver wire is placed in a beaker containing 1 M Cu(NO3)2, what...
Chemistry - Two beakers are placed in a sealed container surrounded with air. In...
chemistry - A student is given 3 beakers: Beaker 1- 50.0 ml of a solution ...
chemistry - I did an experiment where i used straws and water to simulate a ...
chemistry - You have four beakers labeled A, B, C, and D. In beaker A, you place...
Chemistry - Use appropriate chemical principles to explain why water droplets ...
Chemistry - 25.00 mL of heavy water (D2O where D is a hydrogen with a neutron in...

For Further Reading

First Name:
School Subject:
Answer: