[Glorzifen]

Hey, just a quick one: "A solution is 0.126M KCl and 0.148M MgCl2. What are [K+], Mg[2+] and [Cl-]?"

My sol'n: KCl + MgCl2 -->K+ +Cl- + Mg2+ + 2Cl-
I can determine the concentrations from this...but for [Cl-], am I supposed to combine the 2Cl- and the Cl-? Or is it just asking for the [Cl-] that is equal to [KCl]? How do I go about combining them if I am supposed to?

Let me know if anything's hazy. Thanks.

Graeme

[Borek]

You can't write a single reaction equation - there are two separated reactions taking place, each described by its own reaction equation.

[Cl^-] is just a sum of [Cl^-] from all sources.