how to prepare the 0.5 M HCL - kindly explin (Dec/05/2006 )
hi all,
cud some one tell me how to prepare the 0.5 M HCL.
thanx in advance.
take the commercial HCl at 37%, it's 12N
dilute it 24 times.
Never add water to acid. Always acid to water. (it's dangerous)
may i ask why?
tip is never give a glass to acid.
basically it's because the water in contact with acid give an exotermic reaction.
If acid is diluted in water, heat is better expanded in solution.
If it's water in acid, the water temp increase localy, giving risks of explosion
thanx a lot to all great mentors
i want to prepare this becoz i have to prepare the 20% SDS and 0.5M HCL for the MTT to dissolve the formazan crystal.
also tell that i am going right.
thanx again.
basically it's because the water in contact with acid give an exotermic reaction.
If acid is diluted in water, heat is better expanded in solution.
If it's water in acid, the water temp increase localy, giving risks of explosion
to remember well :
if you put a drop of acid in 10 mL of water, only a drop of acid will react (not dangerous), and one drop after an other, you have several non dangerous drop that reacts until you add all your acid.
if you put a drop of water in 10 mL of acid, 10 mL of acid will react with your drop of water : dangerous.
But of course, Fred's answer is much more exact than mine. My little story is just a trick for remember to put acid in water.
tip is never give a glass to acid.
basically it's because the water in contact with acid give an exotermic reaction.
If acid is diluted in water, heat is better expanded in solution.
If it's water in acid, the water temp increase localy, giving risks of explosion
to remember well :
if you put a drop of acid in 10 mL of water, only a drop of acid will react (not dangerous), and one drop after an other, you have several non dangerous drop that reacts until you add all your acid.
if you put a drop of water in 10 mL of acid, 10 mL of acid will react with your drop of water : dangerous.
But of course, Fred's answer is much more exact than mine. My little story is just a trick for remember to put acid in water.
good story Missele
"If you think your life's too placid, add the water to the acid"
Add acid to water, otter. Kinda lame but it gets stuck in my head
cute