On Mon, 21 Feb 2005 16:51:33 -0000, grantfair2001
<
grant.fair@...> wrote:
>
> I built an autotitrator with a chemistry student some years back. It
> used a syringe pump driven by a stepper. We were dropping NaCl
> solution into silver nitrate IIRC (I supplied mechanical/electronic
> assistance, he did the chemistry). The probe was expensive but he
> borrowed it from the school. Would there be a probe which would
> detect the endpoint in this case? Or would visual inspection be just
> as good - in terms of time required?
> Grant
A PH sensor might work, but i find the whole automatic control would be a
major effort,
and would far outweigh the effort of manual care in about all situations i
can imagine.
CuCl is really easy to care for, there are broad tolerances and it is
recoverable if you mess it up.
By the way, german texts about HCl H2O2 etching usually have bad things to
say about stability, going through walls and blasting roofs off in
industrial applications and similar stuff. Only exaggeration with a small
core of truth, or..? I could only imagine violent reactions with MAD
amounts of H2O2. (Which is easy to do in tiny containers but much harder
in a bigger tank). Anyone having first hand facts about those scare
stories?
ST