- Messages
- 1,318
- Reaction score
- 1,374
- Points
- 173
What does the ms say? Usually they allow both reactions ...why can't we use Cu+ instead of Cu2+ ?
We are currently struggling to cover the operational costs of Xtremepapers, as a result we might have to shut this website down. Please donate if we have helped you and help make a difference in other students' lives!
Click here to Donate Now (View Announcement)
What does the ms say? Usually they allow both reactions ...why can't we use Cu+ instead of Cu2+ ?
But according to the eq H2O and NO2 require two e-Even Cu+ has e-
View attachment 58619
Hmm yeah ... But can't you multiply the Cu+ eqn by 2 so to get 2e-?But according to the eq H2O and NO2 require two e-
Copper is oxidized by concentrated nitric acid, HNO3, to produce Cu2+ ions; the nitric acid is reduced to nitrogen dioxide, a poisonous brown gas with an irritating odor. The question says brown gas is formed so here i win.Hmm yeah ... But can't you multiply the Cu+ eqn by 2 so to get 2e-?
What I'm saying is why can't it be this equation too:Copper is oxidized by concentrated nitric acid, HNO3, to produce Cu2+ ions; the nitric acid is reduced to nitrogen dioxide, a poisonous brown gas with an irritating odor. The question says brown gas is formed so here i win.
Copper is oxidized by concentrated nitric acid, HNO3, to produce Cu2+ ions; the nitric acid is reduced to nitrogen dioxide, a poisonous brown gas with an irritating odor. The question says brown gas is formed so here i win.
What I'm saying is why can't it be this equation too:
NO3- + 2H+ + Cu = NO2 + H2O + Cu+
Here NO2 is also formed...
So can't it be either or equations?
---> 2NO3- + 4H+ + Cu = 2NO2 + 2H2O + Cu2+
---> NO3- + 2H+ + Cu = NO2 + H2O + Cu+
I think I got itwhy can't we use Cu+ instead of Cu2+ ?
Is this A2 stuff lol ? :3 I'm an A's studentin 2002 october november
An aqueous solution of iron(III) chloride is used to dissolve the excess of copper metal from printed-circuit boards
the mark scheme allowed both Cu2+ and Cu+ despite the voltage being less than 0.3 V ,when using Cu+ .
Hmmm... Winter 13 they haven't allowed Cu+in 2002 october november
An aqueous solution of iron(III) chloride is used to dissolve the excess of copper metal from printed-circuit boards
the mark scheme allowed both Cu2+ and Cu+ despite the voltage being less than 0.3 V ,when using Cu+ .
Yeah this is A2Is this A2 stuff lol ? :3 I'm an A's student
Well sorry to piss you off thenYeah this is A2
It's no longer part of the syllabus so you don't need to know this.how do you solve this ?
View attachment 58622
How to do question 2.a.ii
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s13_qp_41.pdf
Summer 13 P41
Is there any formula which says how to do it??
The ms is confusing and I can't see anything in text book :/
Metanoia
Someone please help!
For almost 10 years, the site XtremePapers has been trying very hard to serve its users.
However, we are now struggling to cover its operational costs due to unforeseen circumstances. If we helped you in any way, kindly contribute and be the part of this effort. No act of kindness, no matter how small, is ever wasted.
Click here to Donate Now