Problem: The autoionization constant for heavy water (deuterium oxide, D 2O) is 3.64×10−16 at 0°C and 7.89×10−15 at 50°C. Find [D 3O+] and pD of heavy water at 0°C and 50°C.

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We’re being asked to find [D 3O+] and pD of heavy water at 0°C and 50°C.


Recall that Kw is the autoionization constant of water, and is given by:


Kw=H+OH-

[H+] = [H3O+]


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Problem Details

The autoionization constant for heavy water (deuterium oxide, D 2O) is 3.64×10−16 at 0°C and 7.89×10−15 at 50°C. Find [D 3O+] and pD of heavy water at 0°C and 50°C.

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Our tutors have indicated that to solve this problem you will need to apply the Ka and Kb concept. You can view video lessons to learn Ka and Kb. Or if you need more Ka and Kb practice, you can also practice Ka and Kb practice problems.

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Our data indicates that this problem or a close variation was asked in Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition. You can also practice Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition practice problems.