The dilution equation C1V1 = C2V2 is a foundational mathematical principle of solution chemistry based on the conservation of moles, so no citation is needed.
The claim states that solution dilution follows the equation C1V1 = C2V2 based on the conservation of moles. This is a universally taught, fundamental definition and everyday mathematical rule in general chemistry. None of the retrieved papers are necessary to prove or disprove this basic definitional principle; thus, it is categorized as common knowledge.