In article , Steve Firth
writes
Steve S wrote:

snip

Similarly, conc. sulphuric gets very hot when diluted. If attempting to
dilute sulphuric acid *always* add acid to water, *never* the other way
round. That way, if it boils and spits you are more likely to get splashed
with dilute acid. Eye protection etc. is a must.

Hmm but do you reckon he's going to able to buy sulphuric acid stronger
than 1M anywhere? Seems unlikely to me. It's difficult enough finding
hydrochloric acid for pavement cleaning.

bought some 96% Sulphuric from the plumbing merchants last week, cleared
the blockage a treat

--
David