亞硫酸鎂是亞硫酸的鎂鹽，化學式MgSO
3。其最常見的水合形式有6個水分子，使其成為六水合物MgSO
3 ·6H
2O。加熱到40 °C（104 °F）以上時，將脫水成三水合亞硫酸鎂（MgSO
3 ·3H
2O）。[1] 無水形式易潮解，這意味着它很容易從空氣中吸收水分。
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