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Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: sw2672 on October 27, 2006, 03:50:00 AM

Title: reference of Perchloric acid's PKa
Post by: sw2672 on October 27, 2006, 03:50:00 AM

The Pka value of perchloric acid is -10. However, I would like to know the exact reference of which the value is described.
Please help me.

Title: Re: reference of Perchloric acid's PKa
Post by: Borek on October 27, 2006, 04:59:10 AM

In my books -7.3 is listed as given in J.C.McCoubrey, Trans. Faraday Soc., 1955, 18, 1014

However, I recall seeing this year information that some group did experiments checking dissociation constants of strong acids and they found much smaller values.

OK, found it (sci.chem, posted by fkasner):

Quote

The advisor's name was Thomas Fraser Young (usually listed as T. F. Young) professor of chemistry a the U. of Chicago. The work was probably in the period of 1950 to 1960. The method of measuring the concentrations was Raman spectroscopy.

If you happen to locate these papers please post info here.