Question: Need help with these 3 problems pls helps The pH of an aqueous solution at 25C was found to be 8.40. The pOH of this

Need help with these 3 problems pls helps

The pH of an aqueous solution at 25C was found to be 8.40. The pOH of this solution is The hydronium ion concentration is M. The hydroxide ion concentration is M. What is the pH of an aqueous solution of 2.73102M perchloric acid? What is the hydronium ion concentration in an aqueous hydroiodic acid solution with a pH of 1.050 ? [H3O+]=

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