Homework Help: Chemistry

Posted by Supaman on Thursday, January 31, 2008 at 10:39pm.

For the autoionisation of water, it looks like

2H2O(l)-> H3O+(aq) + OH–(aq)

I thought that becuase it is going from liquid to ions, wouldnt the Entropy be greater than 0?

However, I have been told and I have calculated the opposite, that entropy is less than 0. Please Explain .

Chemistry - drwls, Friday, February 1, 2008 at 1:32am
It is an endothermic process. The entropy change is the heat required divided by the temerature, and is negatve because heat energy must be supplied.

It is true that the process occurs spontaneously, but the reverse process is much more likely. That is why so few of the H2O molecules are ionized.

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