Answer:
[H₃O⁺] = 6.31 x 10⁻³ M.
Step-by-step explanation:
pH = - log[H₃O⁺].
∴ 2.2 = - log[H₃O⁺].
∴ log[H₃O⁺] = - 2.2
∴ [H₃O⁺] = 6.31 x 10⁻³ M.
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