[Golden_4_Life]

I need to prep some 40% HCl but cannot rem'ber which I add first to the graduated cylinder?

[Biopolmonkey]

Add acid to the water.

[Golden_4_Life]

 

[408]

Good luck preparing 40% HCl by diluting concentrated hydrochloric acid...

[stewie griffin]

"Do what you oughta, add acid to water"
Stupid I know but it rhymes and people remember it.

[stewie griffin]

Good luck preparing 40% HCl by diluting concentrated hydrochloric acid...

Haha, good point   

[Golden_4_Life]

Good luck preparing 40% HCl by diluting concentrated hydrochloric acid...

*Not sure why I would need "Good Luck" in doing this simplistic procedure of a 2:5 dilution--I think my 5 yr ole son could do this, no? 

*Oh, and StewieGriff--is your avatar pouring acid into water on the pic  beside your post? 

[stewie griffin]

*Not sure why I would need "Good Luck" in doing this simplistic procedure of a 2:5 dilution--I think my 5 yr ole son could do this, no? 
[/quote]
Semantics  . Everyone knows what you mean when you say you're making a 40% solution.
Concentrated HCl is 12M to start with, or ~"36%" (http://www.erowid.org/archive/rhodium/chemistry/equipment/molarity.html   or   https://www.sigmaaldrich.com/chemistry/stockroom-reagents/learning-center/technical-library/reagent-concentrations.html)
And yes my avatar is definitely follow the safety rules 

[408]

Where is 4.8M ever called 40% HCl?    

[aeacfm]

for safety considrations always add acid to water

[xoto]

to about 50% water, add the acid then add the rest of the water to the mark.