January 22, 2021, 11:15:58 AM
Forum Rules: Read This Before Posting


Topic: Will CuO react with HCl?  (Read 39200 times)

0 Members and 1 Guest are viewing this topic.

hongkongrubbish

  • Guest
Will CuO react with HCl?
« on: April 14, 2006, 08:03:07 AM »
If yes,
I wonder why Cu will not react with HCl but CuO will ,
what are the principles behind? ;)

Offline Albert

  • Lonely Wanderer
  • Retired Staff
  • Sr. Member
  • *
  • Posts: 1050
  • Mole Snacks: +112/-22
  • Gender: Male
  • Half Decent Pharmaceutical Chemist
Re: Will CuO react with HCl?
« Reply #1 on: April 14, 2006, 08:20:02 AM »
Yes, it does: 2 HCl + CuO —> CuCl2 + H2O

Copper doesn't react with non-oxidizing acids, such as HCl, in the absence of oxigen. However, if exposed to air, the following reaction takes place:

2 Cu + O2 + 4 H3O+ -> 2 Cu2+ + 6 H2O

hongkongrubbish

  • Guest
Re: Will CuO react with HCl?
« Reply #2 on: April 14, 2006, 08:38:30 AM »


However, if exposed to air....
um... Thanks first

 but "exposed to air" means we need to pump air into the acid or just place it under normal conditions...?

normally there is oxygen in the solution, so will there be any reactions  ::)?

Offline Albert

  • Lonely Wanderer
  • Retired Staff
  • Sr. Member
  • *
  • Posts: 1050
  • Mole Snacks: +112/-22
  • Gender: Male
  • Half Decent Pharmaceutical Chemist
Re: Will CuO react with HCl?
« Reply #3 on: April 14, 2006, 08:43:15 AM »
In a solution the reaction actually takes place...slowly. Spraying an aqueous solution of an acid on, say, a copper layer means you have the same reaction with a different timing.

Offline hkalfighter

  • Regular Member
  • ***
  • Posts: 24
  • Mole Snacks: +2/-1
Re: Will CuO react with HCl?
« Reply #4 on: April 15, 2006, 03:17:03 AM »
is CuO amphoteric ? i see some covalent oxides such as BeO , Al2O3 and ZnO are amphoteric and they react with acid to give metal ions and water but i don't know if CuO behaves the same
the reaction is like BeO + 2H+ > Be2+ + H2O
by the way , i m from Hong Kong too , are u A Level student ?

Offline Alberto_Kravina

  • Assault Chemist
  • Retired Staff
  • Full Member
  • *
  • Posts: 608
  • Mole Snacks: +70/-15
Re: Will CuO react with HCl?
« Reply #5 on: April 15, 2006, 03:28:22 AM »
CuO is not amphoteric

amphoteric oxides

Offline hkalfighter

  • Regular Member
  • ***
  • Posts: 24
  • Mole Snacks: +2/-1
Re: Will CuO react with HCl?
« Reply #6 on: April 15, 2006, 07:43:24 AM »
oh , thanks a lot

hongkongrubbish

  • Guest
Re: Will CuO react with HCl?
« Reply #7 on: April 15, 2006, 11:46:24 AM »
is CuO amphoteric ? i see some covalent oxides such as BeO , Al2O3 and ZnO are amphoteric and they react with acid to give metal ions and water but i don't know if CuO behaves the same
the reaction is like BeO + 2H+ > Be2+ + H2O
by the way , i m from Hong Kong too , are u A Level student ?

haha I am from HK...but sitting for CE  ;D
rare to have HK students here  :o

hongkongrubbish

  • Guest
Re: Will CuO react with HCl?
« Reply #8 on: April 15, 2006, 02:10:54 PM »


However, if exposed to air....
um... Thanks first

 but "exposed to air" means we need to pump air into the acid or just place it under normal conditions...?

normally there is oxygen in the solution, so will there be any reactions  ::)?

btw, can we say that the CuO is basic, and thus neutralization occurs?
because a book tells me that the metals will increase the properties of being a base across the periodic tabe (from right to left) if become oxides
is that true?

Thanksss ! ;D ;D

kkrizka

  • Guest
Re: Will CuO react with HCl?
« Reply #9 on: April 16, 2006, 03:59:04 PM »
Quote
btw, can we say that the CuO is basic, and thus neutralization occurs?
because a book tells me that the metals will increase the properties of being a base across the periodic tabe (from right to left) if become oxides
is that true?
Yes, the O2- in the oxide is a string base. It reacts with water as in the following equation:
O2-+H2O->2OH-

All the O2- will react, but you also have to know the solubility of the oxide to figure out how much of the O2- is avalible for the above reaction.

Offline hkalfighter

  • Regular Member
  • ***
  • Posts: 24
  • Mole Snacks: +2/-1
Re: Will CuO react with HCl?
« Reply #10 on: April 16, 2006, 04:20:31 PM »
how about the mechanism ? does the negative O oxide ion attack the H on H2O to give OH- ?

Offline Alberto_Kravina

  • Assault Chemist
  • Retired Staff
  • Full Member
  • *
  • Posts: 608
  • Mole Snacks: +70/-15
Re: Will CuO react with HCl?
« Reply #11 on: April 16, 2006, 04:22:59 PM »
how about the mechanism ? does the negative O oxide ion attack the H on H2O to give OH- ?
Yes! It is a very strong base - it attracts the H-atom of H2O to form the OH- ion

Sponsored Links