Finding the Ratio of Uncomplexed Zn2+ to Zn(NH3)2+ Using Stability Constant

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CosmicC
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What is the ratio of the uncomplexed Zn+2 ion in a solution that is 10M in NH3, if the stability constant of [Zn(Nh3)4]+2 is 3x10^9.

I am not able to understand why they have given 10M NH3 since we don't know volume or enough info to get moles. We have only stability constant.
 
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You do not need to know the volume or number of moles to figure out the ratio. You can just calculate a ratio of the concentration of uncomplexed Zn2+ to the concentration of the Zn(NH3)2+. A good starting point is to write out the equation for the Ksp for the formation of the complex.