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> After looking around in a number of places, I finally found a source > of Hydrochloric Acid at a hardware store (Most shop keepers looked > at me funny when I started to explain that I wasn't really interested in cleaning concrete.....)
You have to learn the first rule of an aquarium-keeper on the hunt for
goodies that can be used in our hobby -- never own up to tradespeople
that you are going to use the item you seek not for its intended
purpose, but for a frivolous one! :-))
> I found a 5 litre container of Hydrchloric acid (Muriatic - "Spirit > of Salt" ???) for $9.95 (Aus)., which sounded like a bargain to me. > I'll never have to buy any more - unless it has a maximum shelf life???
Stoppered, it will last for about 100 years.
> Anyhow, the label says that it contains 350g/L HCL. I imagine that > this is 350g of HCL in granular form that has been added to each > litre of distilled water. Is this correct?
Aside from the fact, that HCl is a gas, your concentration concept is
> If so, what concentration HCL do I have?
You have a 35% HCl solution.
> How many drops / ml would you guys recommend adding to SLOWLY lower > my pH, considering that the tap water is pH of 8.4 and 120ppm Carbonate Hardness?
I wopuld *strongly* recommend, that you take two parts of water and add
TO THE WATER (NOT the other way around) one part of your 35% HCl. You
will then have approximately a 10% HCl solution.
Now experiment! To a liter, gallon, or whatever add a drop or two of
your 10% HCl and see the result. Continue until you reach the pH you
desire -- then scale up to the volume of your tank.
Another *strong* suggestion: If you have anything living in this tank,
do NOT change the pH more than 0.2 - 0.3 pH units/day! Many will tell
you that they changed pH by a unit (or more), without disastrous
results. True! But that puts needless strain on the fish.
One should remember that pH is on a logarithmic scale: One unit pH
change represents 10-fold change in acidity!
> i do not add CO2 to this tank, I am just trying to lower the pH to a more
> neutral point. I am not concerned about the few fish that live in the
> Steve Amor