I worked with succinic acid long time ago. It dissolves easily in water. It is slightly soluble in ethanol, acetone, glycerol (1,2,3-propanetriol), and diethyl ether. Strictly, it is insoluble in nonpolar solvents such as n-hexane, benzene, and tetracholormethane.

The solvents, you mentioned, dichloromethane "DCM", chloroform, ethyl acetate, will dissolve succinic acid PARTIALLY.

Nizar Matar In my case I try to mix the dissolved succinic acid with a dissolved polymer, but the polymer is soluble neither in water, nor in acetonitrile, nor in ethanol, nor in methanol), then I would have to change the acid for a homologous one to obtain similar results.

what conditions would you obtain a solution in diethyl ether?

I have done experiments with diethyl ether according to the solubility data but the solution is not completely homogeneous.

I know that succinic acid is a "problematic" compound with regard to solubility & other things which are of no concern here. If your research allows the use of other dicarboxylic acids, then I suggest adipic acid (or hexanedioic acid). In my first practical courses as MSc student in 1978, my distinguished professors gave us this acid to work with since it is not "problematic". This acid is soluble in acetone, ethanol, ethyl acetate, and methanol.

When I supervised research in the U.K., I used to make changes for students in their work if they faced big problems. We wanted to get positive results, then, and we succeeded .