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sarah1004 · Oct 28, 2009, 03:14 PM

Write the formulas of the ions(including charges) present in aqueous solutions of the following electrolytes. Make sure it is both mass and charge balanced.

a. K2CO3

b. NH4NO3

c. Na2Cr2O7

d. Mg(C2H3O2)2

I really don't know how to do this.
These are my prelab assignment
So, I don't know...
Please show me how to do this. Thanks

Unknown008 · Oct 29, 2009, 08:41 AM

Well, just give the ions present in the compounds you have.

For example, if you had NaCl, the ions would be $Na^+ \ and\ Cl^-$

Post your answers!

sarah1004 · Oct 29, 2009, 01:08 PM

a.K2CO3
K+ and CO2-/3
b.NH4NO3
NH4+ and NO-/3
c.Na2Cr2O7
Na+ and Cr+6 and O-2

Unknown008 · Oct 29, 2009, 11:15 PM

Correct
Correct
Nope.

Na2Cr2O7 is sodium dichromate (VI). The ion is $Cr_2O_7\ ^{2-}$

Do not worry, you may not have come across this very often. There are quite a few like this one.
$MnO_4\ ^-$ is the manganate ion.
$CrO_4\ ^{2-}$ is the chromate (VI) ion.

Just like sulfate, nitrate. Nitrite is $NO_2 \ ^-$ sulfite is $SO_3 \ ^{2-}$ .

But sulfide is $S^{2-}$ and nitride is $N^{3-}$

sarah1004 · Oct 30, 2009, 02:17 PM

write the formulas of the ions(uncluding charges)present in aqueous solutions of the following electrolytes. Make sure it is both mass and charge balanced.

So,

a) K2CO3-->(2K+)+(CO^-2/3)

So, is it correct answer for the question?

sarah1004 · Oct 30, 2009, 06:24 PM

write the formulas of the ions(uncluding charges)present in aqueous solutions of the following electrolytes. Make sure it is both mass and charge balanced.

So,

a) K2CO3-->(2K+)+(CO^-2/3)

So, is it correct answer for the question?

and
b) NH4NO3-->NH^+/4 + NO^-/3

c) Na2Cr2O7-->2Na^+ + Cr2O^2-/7

d) Mg(C2H3O2)2-->Mg^2+ +2C2H3O2^-

SO is these are answer for the questions?

Unknown008 · Oct 31, 2009, 12:03 AM

Yes, yes, yes and yes! Well done! :)

You're becoming good at it, right? ;)