Re: ORGLIST: sink or float?

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From: Jacob Zabicky (zabicky$##$bgumail.bgu.ac.il)
Date: Sun Jul 08 2001 - 03:56:00 EDT

Hello Javier,

>From the data you gave, IMHO there is no way of telling. The density of ice
and water is strongly influenced by hydrogen bonding. Deuterium bonding is
weaker, but I do not know to what extent does that affect the crystalline
parameters at a given temperature. For example, a weaker H-bonding may mean
a mere 2% increase of the average O-O nearest neighbor distances. The lower
theoretical (crystalline) density thus obtained will compensate for nearly
5.6% increase in molecular mass and make the half-deuterated ice float.

All the best,

Jacob
At 16:33 4/7/1, Javier Cuesta-Perez wrote:
>Dear all,
>An ice cube of D2O sinks in water. An ice cube of
>water floats in water. Would an ice cube of HDO sink of
>float in water?
>
>Javier
>
>_______________________________________
>
>Javier Cuesta-Perez
>javier$##$icr.ac.uk
>Biomolecular Structure Unit
>The Institute of Cancer Research
>15 Cotswold Rd
>Sutton, Surrey
>SM2 5NG, UK
>Phone:(+44) (0)20 8643 8901 (ext. 4568)
>Fax: (+44) (0)20 8643 1675

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