What is the concentration of the Ca2+ ion in a saturated solution?

[Kobebucsfan]

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The Ksp for the [FONT=MathJax_Main]CaCl.[FONT=MathJax_Main]2. is [FONT=MathJax_Main]7.1.[FONT=MathJax_Main]×.[FONT=MathJax_Main]10.[FONT=MathJax_Main]−.[FONT=MathJax_Main]4.. What is the concentration of the [FONT=MathJax_Main]Ca.[FONT=MathJax_Main]2.[FONT=MathJax_Main]+. ion in a saturated solution?

 

[nyubobcat]

CaCl2-->Ca2+ + 2Cl-

Ksp=[Ca2+] [2Cl-]^2
7.1x10^-4=(x)(2x)^2
7.1x10-4=4x^3

just find x, and you're there! the best way to do these is to first write out the equilibrium (K) expression.