nitric acid 68%?

[zichuan]

hi all,

i am new to refining, i would like to check you experts here.

as i got my hands on HNO3 nitric acid 68% is it the correct concentration percentage for aqua regia?

as my hcl is 33% which i understand its enough concentration.

please kindly advice!

thanks!

 

[jeneje]

Yes, you can use 68% to make AR, I think 68% is tech grade HNO3. That is what i use. HNO3 come in both CP and tech Grade CP is chemical pure and around 70% i think.

Ken

 

[FrugalRefiner]

Zichuan,

Both of your acids are as concentrated as you'll normally find. They are each as concentrated as they can be made with normal distillation, referred to as their azeotropes. They'll both work fine for making aqua regia.

Jeneje,

The grade of an acid isn't actually related to its concentration, but to its purity. There are many grades including reagent, lab grade, USP, technical grade, etc. Each grade can be available in various concentrations. The difference between 68% and 70% is hair splitting. For our purposes, they all work the same. The reason technical grade is most often recommended is that it is usually the least expensive.

Dave

 

[jeneje]

Zichuan,

Both of your acids are as concentrated as you'll normally find. They are each as concentrated as they can be made with normal distillation, referred to as their azeotropes. They'll both work fine for making aqua regia.

Jeneje,

The grade of an acid isn't actually related to its concentration, but to its purity. There are many grades including reagent, lab grade, USP, technical grade, etc. Each grade can be available in various concentrations. The difference between 68% and 70% is hair splitting. For our purposes, they all work the same. The reason technical grade is most often recommended is that it is usually the least expensive.

Dave

Thanks Dave for explaining that.

Ken

 

[FrugalRefiner]

I'm just happy I can remember some of this stuff I learned 40 years ago, and even happier to be able to give a little back to the forum. 8)

Dave

 

[zichuan]

thanks all for the understanding of the differences of the percentage. cheers!

 

[8619greg]

what is the storage temp ranges for nitric,sulfuric and hydrochloric acids

 

[necromancer]

each and everyone of these msds were listed right below this post.
http://goldrefiningforum.com/phpBB3/viewforum.php?f=35


one of the sulfuric 93% drain openers msds (there are many types)
http://goldrefiningforum.com/phpBB3/viewtopic.php?f=35&t=17669

sulfuric acid msds
http://goldrefiningforum.com/phpBB3/viewtopic.php?f=35&t=758

nitric acid msds
http://goldrefiningforum.com/phpBB3/viewtopic.php?f=35&t=757

Muriatic Acid (HCl) msds
http://goldrefiningforum.com/phpBB3/viewtopic.php?f=35&t=756

hope this helps !!!

 

[QMFB]

"Tech grade" is a vague misnomer. 68% scientifically is just the concentration where the compound begins to bond with atmospheric H2O and "relaxes" into its stochiometric state.