Is DMSO a base or acid? (Dimethyl Sulfoxide DMSO)

CAS 67-68-5 Dimethyl sulfoxide (DMSO) is a colourless liquid and the most widely used commercial organosulfur compound. It is a polar aprotic solvent that dissolves both polar and nonpolar compounds and is miscible in a wide range of organic solvents as well as water. It has a relatively high boiling point.

Is DMSO a base or acid?

While technically a weak acid, DMSO is more commonly known for its basic properties, particularly as a solvent for reactions involving weak bases.

Acidic properties:
The hydrogen atoms on the methyl groups are weakly acidic.
They are acidic enough to react with strong bases such as sodium hydride, forming dimethyl sodium - a strong base in its own right.

Basic properties:
It is a polar aprotic solvent, meaning that it can solvate positive ions, but it does not have acidic protons to donate.
Dimethyl sulfoxide (DMSO) is a colourless liquid and the most widely used commercial organosulfur compound. It is a polar aprotic solvent that dissolves both polar and nonpolar compounds and is miscible in a wide range of organic solvents as well as water. It has a relatively high boiling point.
 

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