| Pages:
1
..
23
24
25
26
27
..
30 |
CHRIS25
National Hazard
Posts: 951
Registered: 6-4-2012
Location: Ireland
Member Is Offline
Mood: No Mood
|
|
How does one test for the presence of ammonium in Ferrous ammonium sulphate? Suspecting that upon crystalization I have only ferrous sulphate.
The latter I also made and it is the exact same colour as my supposed ferrous ammonium sulphate, although I have extremely large crystals from the
Ferrous ammonium Sulphate, I know that as I was neutralizing the ammonia solution with H2SO4 i went past the neutralisation stage and so brought it
back with the addition of more ammonium solution. The consequences of which meant that there was no longer an equimolar amount of pre-prepared
ferrous sulphate mixing with the ammonium sulphate. Thankyou.
‘Calcination… is such a Separation of Bodies by Fire, as makes ‘em easily reducible into Powder; and for that reason ‘tis call’d by some
Chymical Pulverization.’ (John Friend, Chymical Lectures London, 1712)
Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. (William Penn 1644-1718)
The very nature of Random, Chance development precludes the existence of Order - strange that our organic and inorganic world is so well defined by
precision and law. (me)
|
|
|
DraconicAcid
International Hazard
Posts: 4278
Registered: 1-2-2013
Location: The tiniest college campus ever....
Member Is Offline
Mood: Semi-victorious.
|
|
Quote: Originally posted by CHRIS25  | | How does one test for the presence of ammonium in Ferrous ammonium sulphate? Suspecting that upon crystalization I have only ferrous sulphate.
|
Place a small amount of it into a small beaker. Dampen a piece of litmus paper and stick it to a watch glass and set it on the beaker. Add sodium
hydroxide solution to your solid material. If ammonium is present, it will be converted to ammonia, which will turn the paper blue.
Please remember: "Filtrate" is not a verb.
Write up your lab reports the way your instructor wants them, not the way your ex-instructor wants them.
|
|
|
confused
Hazard to Others
Posts: 244
Registered: 17-3-2013
Location: Singapore
Member Is Offline
Mood: tired
|
|
how badly would a round bottom flask be stressed if it was heated directly on a hotplate without an oil bath to about 300°C+?
|
|
|
Mailinmypocket
International Hazard
Posts: 1351
Registered: 12-5-2011
Member Is Offline
Mood: No Mood
|
|
| Quote: Originally posted by confused | | how badly would a round bottom flask be stressed if it was heated directly on a hotplate without an oil bath to about 300°C+? |
I often use air baths with foil skirts to heat flasks on a hot plate around that temperature, no problem. Don't let the RBF touch the hotplate-that
might cause stress.
|
|
|
Pyro
International Hazard
Posts: 1305
Registered: 6-4-2012
Location: Gent, Belgium
Member Is Offline
Mood: No Mood
|
|
depends on the quality of the flask, if the bottom is touching the hotplate, if you have wrapped Al foil around the top to catch the heat.
personally I think you will never get the flask up to 300*C without an oil bath
all above information is intellectual property of Pyro.  |
|
|
BobD1001
Hazard to Others
Posts: 182
Registered: 29-3-2013
Member Is Offline
Mood: No Mood
|
|
Could anyone say if the following bottle be okay for storage of Concentrated Nitric acid?
http://www.amazon.com/Wheaton-Capacity-Polypropylene-Polyeth...
Would there be concern of pressure buildup from concentrated nitric, and would an amber reagent bottle with a glass stopper better suit my needs?
Thank you
|
|
|
confused
Hazard to Others
Posts: 244
Registered: 17-3-2013
Location: Singapore
Member Is Offline
Mood: tired
|
|
should be ok for nitric acid...not sure about the pressure though, where are you storing it and what concentration is it in?
|
|
|
BobD1001
Hazard to Others
Posts: 182
Registered: 29-3-2013
Member Is Offline
Mood: No Mood
|
|
To Add:
The concentrated nitric acid will be produced by vacuum distillation, so likely in the neighborhood of 90%+. It will be stored at ambient temperature
as I do not have a lab freezer, this ambient temperature will be a relatively constant approximately 21 degrees C.
[Edited on 5-4-2013 by BobD1001]
|
|
|
CHRIS25
National Hazard
Posts: 951
Registered: 6-4-2012
Location: Ireland
Member Is Offline
Mood: No Mood
|
|
| Quote: Originally posted by DraconicAcid | | Quote: Originally posted by CHRIS25 | | How does one test for the presence of ammonium in Ferrous ammonium sulphate? Suspecting that upon crystalization I have only ferrous sulphate.
|
Place a small amount of it into a small beaker. Dampen a piece of litmus paper and stick it to a watch glass and set it on the beaker. Add sodium
hydroxide solution to your solid material. If ammonium is present, it will be converted to ammonia, which will turn the paper blue.
|
Thankyou, or basically do as you suggest but could stick the litmus directly to the inside of the beaker near the top, will try anyway.
‘Calcination… is such a Separation of Bodies by Fire, as makes ‘em easily reducible into Powder; and for that reason ‘tis call’d by some
Chymical Pulverization.’ (John Friend, Chymical Lectures London, 1712)
Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. (William Penn 1644-1718)
The very nature of Random, Chance development precludes the existence of Order - strange that our organic and inorganic world is so well defined by
precision and law. (me)
|
|
|
Pyro
International Hazard
Posts: 1305
Registered: 6-4-2012
Location: Gent, Belgium
Member Is Offline
Mood: No Mood
|
|
you should get the type with the aluminium lining. the Al will passivate and won't let it through the cap.
all above information is intellectual property of Pyro. |
|
|
confused
Hazard to Others
Posts: 244
Registered: 17-3-2013
Location: Singapore
Member Is Offline
Mood: tired
|
|
but doesn't the PTFE liner prevent nitric acid fumesfrom passing through the cap?
|
|
|
confused
Hazard to Others
Posts: 244
Registered: 17-3-2013
Location: Singapore
Member Is Offline
Mood: tired
|
|
im trying to obtain some mercury metal would a mercury tilt switch or mercury thermometer contain more mercury?
(i know it's a waste of perfectly great thermometers but those are the only 2 sources a can get mercury in my country  )
im asuming that a thermometer with a higher temperature range would contain more mercury?
|
|
|
hissingnoise
International Hazard
Posts: 3940
Registered: 26-12-2002
Member Is Offline
Mood: Pulverulescent!
|
|
You shouldn't assume that all tilt switches will contain elemental mercury . . .
|
|
|
confused
Hazard to Others
Posts: 244
Registered: 17-3-2013
Location: Singapore
Member Is Offline
Mood: tired
|
|
...wouldn't a mercury tilt swtich contain mercury?
|
|
|
Finnnicus
Hazard to Others
Posts: 342
Registered: 22-3-2013
Member Is Offline
|
|
Question.
Good use for large amounts of Ca(OH)2?
|
|
|
confused
Hazard to Others
Posts: 244
Registered: 17-3-2013
Location: Singapore
Member Is Offline
Mood: tired
|
|
limewater to test for CO2?
synthesis of Sodium/Potassium hydroxide with reaction between sodium/potassium carbonate and calcium hydroxide?
|
|
|
Finnnicus
Hazard to Others
Posts: 342
Registered: 22-3-2013
Member Is Offline
|
|
Potassium carbonate... OTC?
Edit: then I could decomp the resulting Calcium carbonate into CaO?
[Edited on 8-4-2013 by Finnnicus]
|
|
|
confused
Hazard to Others
Posts: 244
Registered: 17-3-2013
Location: Singapore
Member Is Offline
Mood: tired
|
|
i got mine at a store selling pottery supplies, usually used as a glaze
|
|
|
confused
Hazard to Others
Posts: 244
Registered: 17-3-2013
Location: Singapore
Member Is Offline
Mood: tired
|
|
possible, but that would require alot of heat above above 840 °C
|
|
|
Lambda-Eyde
National Hazard
Posts: 857
Registered: 20-11-2008
Location: Norway
Member Is Offline
Mood: Cleaved
|
|
Make benzene?
This just in: 95,5 % of the world population lives outside the USA
You should really listen to ABBAPlease drop by our IRC channel: #sciencemadness @ irc.efnet.org
|
|
|
Finnnicus
Hazard to Others
Posts: 342
Registered: 22-3-2013
Member Is Offline
|
|
Explain.
|
|
|
Vargouille
Hazard to Others
Posts: 380
Registered: 16-4-2012
Member Is Offline
Mood: No Mood
|
|
A dry distillation of Ca(OH)2 and sodium benzoate yields benzene and friends. You can find more information in the member publications, I believe.
|
|
|
Finnnicus
Hazard to Others
Posts: 342
Registered: 22-3-2013
Member Is Offline
|
|
Lovely thank you.
|
|
|
Boron Trioxide
Harmless
Posts: 42
Registered: 18-6-2012
Member Is Offline
Mood: No Mood
|
|
So I am building a magnetometer, and I need a liquid or solid that has the most hydrogen atoms per volume, does anyone know what hydrocarbon or other
substance would have the most hydrogen molecules per volume that is easily obtainable.
Thanks for your help
|
|
|
Metacelsus
International Hazard
Posts: 2531
Registered: 26-12-2012
Location: Boston, MA
Member Is Offline
Mood: Double, double, toil and trouble
|
|
Water? 2 mol H atoms / 18 g ; 1 g / cm^3 = 0.111 mol H atoms / cm^3
Paraffin wax? ~2 mol H atoms / 14 g ; ~0.8 g / cm^3 = 0.114 mol H atoms / cm^3
|
|
|
| Pages:
1
..
23
24
25
26
27
..
30 |
![[*]](images/xpblue/default_icon.gif){kind=icon}
