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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: nimbusracing on August 22, 2005, 05:18:10 AM

Title: Electrovalency Question (easy)
Post by: nimbusracing on August 22, 2005, 05:18:10 AM

hi guys

im just wondering, if the electrovalency of copper is not given,
do you use Cu+ or Cu2+

likewise with Iron. Do you use Fe2+ or Fe3+

thanks for any help

Title: Re:Electrovalency Question (easy)
Post by: xiankai on August 22, 2005, 05:42:41 AM

if i was presented with such a problem, i would select the most stable electrovalency of that element.

just like Cu2+ and Fe3+

thats just me

Title: Re:Electrovalency Question (easy)
Post by: nimbusracing on August 22, 2005, 05:46:12 AM

can i quickly ask you another question!!

how would you write an ionic equation for:

Fe(s) + HCl(aq) ---> FeCl2(aq) + H2(g)

Title: Re:Electrovalency Question (easy)
Post by: xiankai on August 22, 2005, 05:51:28 AM

see if there are any changes in electrovalency.

as such, Fe + 2H+ + 2Cl- --> Fe2+ + 2Cl- + H2

in FeCl2, the electrovalency of Fe is 2 because in any compound that does not have a charge, ie. 0, the charges on the elements in it must cancel out.

so, in order to balance the double negative charge on 2 chloride ions, the iron must possess a postive of charge of +2.

Title: Re:Electrovalency Question (easy)
Post by: nimbusracing on August 22, 2005, 06:12:26 AM

your appearing offline i cant speak to you!!!

Title: Re:Electrovalency Question (easy)
Post by: nimbusracing on August 22, 2005, 06:13:47 AM

anyway as i was saying, on my general reaction types handout it says...

Metal (not Cu, Ag, Hg) + acid --> salt + hydrogen

so should i go with the Cu + HCl ---> No reaction