Certain substances (such as strong acids and soluble ionic salts) undergo ionization or dissociation rather than simply dissolving as intact molecules when placed in water. This chemical principle is standard textbook knowledge and does not require citation.
The claim is a fundamental, well-established chemical fact taught in basic chemistry (electrolytes vs. non-electrolytes, dissociation/ionization in aqueous solution), making it common knowledge. None of the retrieved papers specifically target or test this general definition as a primary hypothesis, so no citation indices are needed.