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Subject: Re: [Homebrew_PCBs] CuCl pH testing

From: DJ Delorie <dj@...>
Date: 2007-12-09

Adam Seychell <a_seychell@...> writes:
> pH is nothing more than a logarithmic scale of hydrogen ion
> activity. Some of your HCl will be exists as HCl molecules while
> the remainder dissociates as hydrogen ions and chloride ions. To
> further mess up pH, not all of these hydrogen ions are active at
> such high concentrations. Since pH only responds to active hydrogen
> ions you will get a false low acid reading.

Ok, that seems obvious enough with that explanation. Thanks!