Definition: A diacidic substance is a compound that has an electronegative part (the negative charges on its atoms) and a positive charge (usually +1 or -1, depending on the specific element). It can be defined as a molecule with one or more positively charged atoms and two or three negatively charged atoms. These atoms are bonded to form a linear structure, which is why it's often referred to as a linear diacidic compound. For example, in HCl (hydro
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