On Tue, 22 Apr 2008 05:23:25 -0400, Phisherman
wrote:

On Mon, 21 Apr 2008 20:59:05 -0700 (PDT), ransley
wrote:

On Apr 21, 7:22*pm, Norminn wrote:
dadiOH wrote:
Oren wrote:

My acid wash will already be diluted (1 part acid to 4-6 parts water).

Be sure to add the acid TO the water, not water to acid. *Wrong way =
violent bubbling/splashing and is dangerous.

Reminds me of highschool chemistry class.

Muriatic does not react to water violently, so I would take the
previous posters Bull **** here to bull ****, Muriatic FUMES,
Muriatic eats metal pipe. It wont react to added water as sulfuric
will, I use Muriatic, maybe even tomorrow AM to clean stone.


Muriatic acid can splatter, emit caustic fumes, corrode metal, cause
skin burns and blindness. It contains HCl, one of the strongest
acids. If diluted properly (adding acid TO the water), it becomes
less hazardous. Not a wise idea to have a bottle of it laying around.

The rule of acid to water is a good one for the non chemist, and
usually for chemists as well. It is a general rule of thumb that is
just easy to remember and follow. If you understand the
characteristics of what you are working with, then you can bend the
rules, but with the proper techniques and understanding. The unwise
should never add water to acid. It is clear from most of the posts,
that the general rule of acid to water should be followed by just
about eveyone responding to this post.

All concentrated mineral acids develop heat when mixed with water. The
problem is that some acids, like concentrated sulfuric acid are prone
to a highly localized and large release of heat of mixing. The
dissolution especially in this case becomes violent, with subsequent
violant spattering of acid due to localized steam generation.

Do chemist ever do the reverse with acids? Sure, but not before
carefully thinking about how they will control the mixing conditions
and adjusting for the consequences.