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Topic: Electrovalency Question (easy)  (Read 4928 times)

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nimbusracing

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Electrovalency Question (easy)
« 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

Offline xiankai

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Re:Electrovalency Question (easy)
« Reply #1 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
one learns best by teaching

nimbusracing

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Re:Electrovalency Question (easy)
« Reply #2 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)

Offline xiankai

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Re:Electrovalency Question (easy)
« Reply #3 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.
one learns best by teaching

nimbusracing

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Re:Electrovalency Question (easy)
« Reply #4 on: August 22, 2005, 06:12:26 AM »
your appearing offline i cant speak to you!!!

nimbusracing

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Re:Electrovalency Question (easy)
« Reply #5 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

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