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RE: Muriatic Acid - HCL 34% and TDS/conductivity
Hi Lee,
So it should take just a few drops to adjust the pH of 17 gal. of water. At
least that is a starting point. Thank you.
I also appreciate the conversion factor for TDS to microsiemens.
Peace,
~RJ~
-----Original Message-----
From: owner-killietalk at aka_org [mailto:owner-killietalk at aka_org]On
Behalf Of LeeH920226 at aol_com
Sent: Saturday, May 04, 2002 8:01 AM
To: killietalk at aka_org
Subject: Re: Muriatic Acid - HCL 34% and TDS/conductivity
RJ,
I am a retired chemist and I have used muriatic acid in aquariums. I
diluted the commercial strength stuff to a nominal 1% solution and then used
it dropwise at that 1% concentration. It moves the pH very quickly with a
few
drops even at that concentration. I stopped using it when my water supply
started coming in at a lower pH and also because I started using peat
filtration to lower the pH.
I must also caution you about handling the 34% material. Keep it from
your eyes, protect your hands and don't breath the fumes. Also you should
add
one ml of the 34% stuff to 33 ml of DI or RO water to dilute it. DO NOT add
water to it -- it heats up and can be dangerous.
As far as TDS and conductivity. They are related and different. Any
conductivity is induced in water by dissolved ionic materials - mostly
solids, but gases like hydrochloric acid (muriatic acid 100%) can also cause
increased conductivity. Most commercial TDS meters are simply conductivity
meters with a different scale. The conversion from conductivity to TDS is
normally done for the meters by using potassium chloride and a 2/1
conversion
factor. However, most water doesn't contain potassium chloride, but a
combination of other salts, so the conversion is more like 1.7. So a
conductivity of 200 microsiemens/cm is converted by the meter scale to 100
ppm but in actuality it really is about 120 ppm. The absolute number is less
important than the approximate number. The most important thing is the
sudden
changes which can kill fish, especially when going from higher to lower
numbers.
Lee Harper
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