flakten
Harmless
Posts: 12
Registered: 16-5-2012
Member Is Offline
Mood: No Mood
|
|
Help interpreting short text (SOLVED)
I'm just starting chemistry studies in university level. There's an expression I can't interpret.
"...precipitated from aqueous CuSO4..."
How much CuSO4 should there be, should it be 1:1 with the substance which is dissolved and precipitated or just a small presence of the salt to help
dissolving the substance?
I'm reading ahead in the books and I'm trying to understand the experiment. This is the one part I've failed to interpret properly, and no search has
answered it.
Can you more experienced chemists help me?
[Edited on 24-6-2016 by flakten]
[Edited on 24-6-2016 by flakten]
|
|
|
aga
Forum Drunkard
Posts: 7030
Registered: 25-3-2014
Member Is Offline
|
|
Might be better to post the full text as we can't guess what is being precipitated.
|
|
|
PHILOU Zrealone
International Hazard
Posts: 2893
Registered: 20-5-2002
Location: Brussel
Member Is Offline
Mood: Bis-diazo-dinitro-hydroquinonic
|
|
We would need the original text or at least paragraph to get a better general view of the problem to give you a correct answer.
CuSO4 into water is Cu(2+) and SO4(2-) both the cation and or the anion can be precipitated if correct anion or cation is joined...
CuSO4(aq) + 2 NaOH(aq) --> Cu(OH)2(s) + Na2SO4(aq)
reduced equation
Cu(2+) + 2 OH(-) --> Cu(OH)2(s)
CuSO4(aq) + BaCl2(aq) --> CuCl2(aq) + BaSO4(s)
reduced equation
SO4(2-) + Ba(2+) --> BaSO4(s)
CuSO4(aq) + BaS(aq) --> CuS(s) + BaSO4(s)
reduced equation
Cu(2+) + S(2-) --> CuS(s)
SO4(2-) + Ba(2+) --> BaSO4(s)
--------------------------------------
Cu(2+) + S(2-) + SO4(2-) + Ba(2+) --> CuS(s) + BaSO4(s)
(aq) means dissolved and ionized into water
(s) means solid precipitate
PH Z (PHILOU Zrealone)
"Physic is all what never works; Chemistry is all what stinks and explodes!"-"Life that deadly disease, sexually transmitted."(W.Allen)
|
|
|
flakten
Harmless
Posts: 12
Registered: 16-5-2012
Member Is Offline
Mood: No Mood
|
|
Thanks! Your text was enough for me to understand the experiment.
|
|
|
PHILOU Zrealone
International Hazard
Posts: 2893
Registered: 20-5-2002
Location: Brussel
Member Is Offline
Mood: Bis-diazo-dinitro-hydroquinonic
|
|
I haven't learned pedagogy of chemical science teaching for nothing then     
PH Z (PHILOU Zrealone)
"Physic is all what never works; Chemistry is all what stinks and explodes!"-"Life that deadly disease, sexually transmitted."(W.Allen)
|
|
|
Texium
|
Thread Moved
4-7-2016 at 17:34 |
![[*]](images/xpblue/default_icon.gif){kind=icon}
