Nitric acid

[LaurenceOs]

sorry mate my fault i meant nitric acid

 

[hazza001]

hello all,

I am very new to gold refining, infact this is my first post, i was wondering, i bought some nitric acid in a 5molar solution, is this too strong? and what is the strength in a percentage? Any help would be much apreciated :mrgreen:

Thankyou

 

[goldsilverpro]

Concentrated nitric acid is about 70%, by weight, which is about 16 molar. Your 5 molar is, therefore, about 22%, by weight. When it's used for dissolving silver or copper, the 70% is usually cut 50/50 with water. That would be 8 molar. When used in aqua regia, the 70% nitric is usually used undiluted in combination with hydrochloric acid.

Your 5 Molar would work in both of these applications, but the reactions would be slower.

 

[hazza001]

Great thankyou =D

 

[67eod]

Hi,

I have had no problems making nitric with sodium nitrate which is very cheap, $35.00 for 20 lbs. I use Napa battey acid $12.00 for five gallons. If I want it stronger I usee Roto drain cleaner.

Bob Noble

 

[cheese]

Laurence,
Not sure if you had your question answered...
If you look at the sticky note at the top of the
CHEMICALS board you will find one titled
refining chemicals: supplers

Within that post is a listing for

http://www.hyperdeath.co.uk/chemicals/

Under inorganic chemicals they list:

Nitric Acid
Formula: HNO3
Synonyms: –

Suppliers
• Some hydroponics suppliers sell it as a "pH Minus" (i.e. an agent to decrease the pH of water) for use in hard water areas.

Elements Hydroponics Centre (UK)
GroWell Hydroponics (UK)
HydroHobby (UK)

• Some alternative photographic suppliers sell it.

Artcraft (USA)

• Some specialist art suppliers sell it.

Kremer Pigments (Global)


It may be worth a look

 

[dick b]

I have a question.

When making poormans nitric, we use nitrate of soda and sulfuric acid.

What about using ammonium sulfate+sulfur (NH4)2SO4, 21-0-0+24(S) instead of nitrate of soda? Would that reduce the amount of sulfuric acid needed in Lazersteves receipe?

I was looking on Simplot's website for Nitrate of soda and came across this.

It's getting harder to find Nitrate of soda.

Thanks to all in advance.

dickb

 

[Platdigger]

I believe the nitrogen in ammonium is in the wrong form to make nitric in this way.
Are you able to obtain ammonium nitrate?
That could be an option.

 

[Anonymous]

hello Ive been a member for A short while this is my first post. I have been too busy blinding my self absorbing all of your guys wisdom thank you very much.Lazer,Harald,silver Pro, and all of you.
any how, i too have struggled on getting nitric acid not willing to pay the outrageous $120 a gallon for 70% lab grade.
And since i have built me a half way desent lab i make it my self with sodium nitrate at darn near lab grade.well my point is that i went to every garden and hardware store looking and could only find sodium nitate/ potasium nitrate that had urea in it. i spent way to much time and gas. ok now the point.... i finally stumbled apon a potery web page and found that sodium nitrate is use in the glaze when firing potery. and waahla 5 mile from my house a potery supplie shop. with high grade sodium nitrate. a little costly at $16 and some change for 10 pounds but never the less no paper work, good grade. it gets a little cheeper the more u buy. any how thanks again guy and gals if there are any im not sure.