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What is the pH of a solution that has a hydronium ion concentration of 8.26 ´ 10–5 M?
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What is the pH of a solution that has a hydronium ion concentration of 8.26 ´ 10–5 M?

User FabLouis
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pH = -log[H3O+] = -log(8.26 x 10^-5) = 4.083 (three decimal places because the concentration had three sig figs)

User KostasRim
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