How to retrieve root passwd on Mac OS X 10.7.4

HI
I am trying to "chown" a directory and it's files but I recieve operation not permitted. I believe I need to become root "su - root" to performe chown.
My question is how do I retrieve root password?
Thanks

By default, the root user is not enabled. Its password does not exist until you enable the root user and specify one.
Why do you need to change ownership of a directory? This should not be necessary, and is likely to cause problems. Whatever you want to do can almost certainly be performed more safely another way.

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