In article 4522b600$0$81800
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p says...

snip

ALWAYS add acid to water NEVER the other way round. The way it was explained
to me is: when adding acid to water, the first drop of acid to hit the water
will be immediately diluted along with the rest of the pour; if you do it
the other way round, the first drop of water that hits the concentrated acid
will immediately explode in steam, along with some of the rest of the pour
and this can hit your eyes, face, skin and other items nearby doing some
serious damage.

snip

"There he lies, cold and placid,
because he added water to the acid."

--
Keith