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Topic: Writing balanced net equations!  (Read 5045 times)

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Offline hoggsie

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Writing balanced net equations!
« on: September 29, 2006, 01:27:54 AM »
Hi, I have no idea what balanced net equations mean, let alone write them.

a.   An aqueous solution of bromine is added to copper metal, producing copper(II) ions and bromide ions

           Bromine aqueous is Br-, isn't that the same as bromide ions??

b.   An aqueous solution of iron(III) chloride is reacted with aqueous potassium iodide to form iodine; assume that the iodine dissolves in the solution
Not sure how to balance etc.

c.   Hydrogen sulfide gas is bubbled into iron(III) chloride solution, producing iron(II) ions and a colloidal suspension of sulfur

Offline mike

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Re: Writing balanced net equations!
« Reply #1 on: September 29, 2006, 01:39:01 AM »
a) bromine Br2, copper Cu, copper(ii) Cu2+ bromide Br-

b) iron(iii) chloride FeCl3 potassium iodide KI, iodine I2

c) hydrogen sulfide H2S iron(iii) chloride FeCl3 iron(ii) Fe2+
There is no science without fancy, and no art without facts.

Offline hoggsie

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Re: Writing balanced net equations!
« Reply #2 on: September 29, 2006, 04:13:37 AM »
Br2(l) + Cu(s) ? Cu2+(aq) + 2Br (aq)
2FeCl3 + 6KI ? 3I2 + 6KCl + Fe3+

Offline hoggsie

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Re: Writing balanced net equations!
« Reply #3 on: September 29, 2006, 04:58:20 AM »
Acidified KMnO4 is added to NaClO3 solution, producing Mn2+ ions and ClO4- ions in solution

KMnO4 + NaClO3 ? Mn2+ + ClO4- + ? What else?

An aqueous solution of iron(II) ions is oxidised to iron(III) by an acidified solution of dichromate ions, Cr2O72-

Fe2+ + Cr2O72- ? Fe3+ +

Zinc is added to nitric acid to produce Zn2+ ions and nitrous oxide, N2O (laughing gas)
Zn + 2HNO3 ? Zn2+ + N2O + H2O

Offline jennielynn_1980

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Re: Writing balanced net equations!
« Reply #4 on: September 29, 2006, 11:06:43 AM »
Steps to writing a balanced ionic equation:

1. write a balanced equation
2. ionize all aqueous substances (not gases or precipitates)
3. Eliminate ions common to both sides of the equation
4. check for the balance of atoms
5. check for balance of charges

If you don't know how to balance an equation at all here is a great website with a great tutorial:
http://www.wfu.edu/~ylwong/balanceeq/balanceq.html

Hope this helps :)

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