Bob Humes wrote in 050328 MMDigest:


>> Note: even with dilute muriatic acid, for safety sake always further
>> dilute it by adding the acid to the water not the other way around
>> or it can boil up on you!


I use the following bit of doggerel to remember this important point:

  May her rest be long and placid,
  She added water to the acid.
  The other girl did as she oughter
  And added acid to the water.

Mark Williamson
Australia