making nitric acid

[boris_73]

thank you once more

[boris_73]

sorry one more thing how many times would i have to distill it to get pure or purish i mean no impurites at 70% concentrated

[YT2095]

twice should be perfectly fine, once without the H2SO4 and once with it. then it`s entirely down to you how much de-ionised water you add to get the correct percent conc you want

 

 

but again, I can`t vouch for the impurities present in the product, and so you`ll have go with this educated guess

[boris_73]

i have to add the H2SO4 i thought i could just distill it with out H2SO4 because i thought it forms a azeotrope with water at 70% which is the conc i want and adding H2SO4 dehydrates it and is able to get the concentration around 98% and also if i order 2 bottles i reckon it will tell me the ingridents. it should do should'nt it if not how could i tell if it does have impurities

[YT2095]

one bottle should tell you the ingredients

[boris_73]

yes but i want about 1ltr of the nitric acid and considering about 62% of its water possibly something else it only leaves me with 380ml which is enough but not enough for different experiments. so should i add the sulphuric acid or would distilling it without the sulphuric acid give me my 70% conc acid

[YT2095]

if the bottle is 1 litre and it`s 38% nitric, how many bottles are needed to make 1 litre of 70% nitric?

 

 

c`mon dude, use your head! you`ll be asking me to make it for you next!

[boris_73]

if the bottle is 1 litre and it`s 38% nitric' date=' how many bottles are needed to make 1 litre of 70% nitric?

 

 

c`mon dude, use your head! you`ll be asking me to make it for you next! [/quote']

i dont want 1ltr exactly i should have said but i would rather have more then less. 2 bottles would be suffice all though at a £5 delivery charge i might just buy 5 bottles that way i wont have to keep paying £5 if i want some nitric acid i'll have enough to last me a long time

[boris_73]

you still havent answerd my question though you should become a politician do i have to add the sulphuric acid to get 70% conc i am pretty sure you dont but i just want to check

[YT2095]

i DID actualy answer that, but you went off on a tangent about impurities etc...

 

 

I said: "twice should be perfectly fine, once without the H2SO4 and once with it. then it`s entirely down to you how much de-ionised water you add to get the correct percent conc you want

 

 

but again, I can`t vouch for the impurities present in the product, and so you`ll have go with this educated guess "

 

and so, if you do it that way you`ll not go wrong, and you`ll get a good clean product, BUT I don`t know what the impurities are, if they have a lower BP (also prior mentioned!) they may pass on also.

 

I don`t know what else to tell you here, it`s all there for the reading!

[boris_73]

there are three more things how much sulphuric acid should i add to the nitric acid and where did you get your glass rods from and what temperature should i heat the homemade nitric acid using potassium nitrate and sulphuric acid these are the last thing's i am going to ask and thank you for helping me

[budullewraagh]

i dont think the amount of sulfuric you add is really a problem; just make sure it is there. get glass rods from chem suppliers online. heat the nitrate/sulfuric mix to 150 or so and i think youre set

[boris_73]

budullewraagh when you are making nitric acid from potassium nitrate and sulphuric acid does'nt water mainly come out for the first 5 minutes or so then the nitric acid comes out. i suppose i could test it with a ph indicator strip

[budullewraagh]

you'll want to be careful when working with that. nitric acid gas is bloody corrosive. if you wanted to be smart, you'd have a few drops of methyl orange in the glass tubes to test for pH

[boris_73]

where could i buy some methyl orange

[YT2095]

simple, goto Argos and buy their Chem set for kids, it contains all you`re likely to need of Meth Orange and 1 or 2 other goodies

 

 

sounds lame at face value I know, but I`ve bought 1 or 2 in the past, exactly for that purpose, it was alot cheaper than Sci-Chem

[boris_73]

thank you very much i always wanted to know what were in those chemistry kits as well

[boris_73]

i have looked into the argos book and it appers they no longer sell those type of chemistry sets only worm farms fossils making strange plants and volcanoes etc.

[boris_73]

yt how do you test to see when your solution starts producing nitric acid not water

[YT2095]

I always look for the orange/brown gas, and I start with conc acid anyway, so I don`t ever have to worry about water all that much

[pulkit]

If methyl orange is hard to get, you could always use a home-made indicator.

Red-cabbage juice does the trick.

[YT2095]

doesn`t red cabbage juice only indicate Alkali, like Beetroot or Turmeric does though?

 

I only ask as red cabbage is often pickled in Vinigar (an acid) and there`s no color change

[pulkit]

I have not worked with it myself because red cabbage is frightfully expensive around here. But this resource would have me believe that it does indeed change colour at an apropriate pH to be useful as an indicator in the reaction in question.

[YT2095]

aha, that explains it

 

the color change is far more noticable with alkali than acids as I suspected, although there is a slight change for acids

 

 

cheerz

[Gilded]

Heh, the red cabbage juice is probably the most basic experiment with acids/pH. I remember doing it when I was 9 or something.