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membrane/donnan equilibrium problem


chiaki_asuka09

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Here's my problem:

 

At the start of a membrane equilibrium experiment, the first compartment contains 1.0 L of solution with an NaX concentration of 0.10 mol/L, where X- cannot pass through the membrane. The second compartment has 2.0 L of 0.030 M NaCl. Find the concentration of Cl- ions in the first compartment after equilibrium is established.

 

okay. i usually know how to solve this type of problem if the volume of the solutions in the first compartment and second compartment are equal. Our professor said that for a donnan equilibrium it is important that volume of the solutions are equal. However, in the given problem, it is not equal and now, i do not know what to do. thank you.

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You have the same amount of Cl- ions in 1 litre of 0.060M solution or 4 litres of 0.015M solution, presuming you don't have to work out how long it would take to reach equilibrium in which case the concentration will matter, the volumes can be interchanged if the concentration is change proportionality.

 

Volume (L) X Concentration (M) = Moles

Edited by Psycho
Added Relvant equation
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