This is a question that requires some practical knowledge. I've looked through the literature (Google Scholar, SciFinder, etc.), and I simply cannot find hard data on this, which is frustrating.

 

How soluble is sodium chloride/bromide in dichloromethane? Obviously it's not very soluble at all, but I'm looking to do a salt metathesis that depends on it being very insoluble. The other salt that will form in this metathesis should be very soluble in DCM and may stay insolution with a little toluene added, which I could use to suppress the solubility of the NaCl/Br. All reactions will be carried out in anhydrous conditions.

 

Anyway, just wondering if anyone has any direct experience with this.

I think it dissolves it to a very, very minor extent. Of course, the best way to find out failing reliable data searches would be to try and dissolve some, filter off the solution and see how much NaCl you have left or evaoprate the DCM and see how much NaCl was dissolved (the latter might be easier).