# Problem: Explain why a sample of pure water at 40 °C is neutral even though [H 3O+] = 1.7 × 10−7 M. Kw is 2.9 × 10−14 at 40 °C.

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Explain why a sample of pure water at 40 °C is neutral even though [H 3O+] = 1.7 × 10−7 M. Kw is 2.9 × 10−14 at 40 °C.