An aqueous solution of KCl04 will be neutral. The K+ is the cation of a strong base (KOH), thus it is a neutral ion and has no effect on the pH of the solution. The Cl04- is from a strong acid (HClO4), thus it too, is a neutral ion. A solution of this compound in water will, therefore, be neutral.
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Gwen Sibert, at the
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