Natural Science Forum / Chemistry / Electrochemistry / April 2006

I need a batterie that provides 8V/200mA, i've been using a standard 9v
batterie. It works fine but the power holds for very little time.
What can I use to have a long duration and small size ( more or less the 9v
batterie).

I have a Canon binocular and (analog) camera both of which use the above
battery. The Canon goes through the battery pretty fast, as it's
stabilized. I want to buy several for a trip next month, and wonder
whether any of you have checked different manufacturers' offerings and

Is it possible to measure an Electromagnetic field near one hose with
NaCl Solution (electrolyte), if I pump that solution in circle with one
pulse-pump (puls presure).
I mean, there is pulse movement of ions in that hose, so that movement

Calculator/battery question.
I have a few Casio fx-270w PLUS calculators that use a single LR44
type button battery. When I last used the calculators a couple of
years ago, they worked fine. When I turned them on today, 2 out of the

Introduction
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Please can someone help me with a problem I've got.  I have recently bought
two GPS enabled GSM mobile phones with the view of installing them in each

Here's one for the Strange But True files:  The Brookstone Sensor
Clock http://www.brookstone.com/shop/product.asp?product_code=492116
doesn't light up it's light with brand new Duracell batteries, but
works just fine with Maxell brand.  I was all ready to get angry with

Could somebody explain to me why the CRC Handbook shows different
standard electrode potentials for half-reactions done stepwise and all
at once?  For example, chlorate to chloride (alkaline) is given as 0.6v,
approximately.  Chlorate to chlorite to hypochlorite to chloride adds ...

I'm looking for a NiMH battery charger.  
I've narrowed the search down to a
MAHA MH-C801D 8 position AA/AAA charger
and a

Question: Measuring Internal Resistance of small household batteries
Hi, is there any difference in accuracy between a $3000 Hioki and a
$200 Rim (Germany) internal resistance battery tester, for testing
alarm or camera (lithium) and gel cel (UPS) batteries?

I asked a similar question on newsgroup: uk.d-i-y, where
there's some talk of cheap and expensive tools, and the
quality of the batteries in them. No-one seems to know
the answer there. Any ideas or pointers here?

I have a question about galvanic corrosion involving aluminum, zinc,
steel and other metals in a saltwater marine environment.
I have a boat with an inboard Chevrolet 350 V-8 engine which is
raw-water-cooled. What that means is that salty seawater is drawn from

I have a question about galvanic corrosion involving aluminum, zinc,
steel and other metals in a saltwater marine environment.
I have a boat with an inboard Chevrolet 350 V-8 engine which is
raw-water-cooled. What that means is that salty seawater is drawn from

The figure of 1.2v seems to be use as the max an aqueous double-layer
capacitor can operate.
Is this voltage electrode material dependent or is it mainly based on the
electrolyte e.g. water?

Hi, sorry if this is not the right newsgroup, or if this has already
been posted, but I'd like to know if anyone of you can tell the
difference between these batteries groups:
SR44, SR44E, SR44W, SR44SW