[cwag]

Originally Posted by Undermyskin

It's correct, I think. I've never dealt with a K questions that have solid in it, to my ignorance, I suppose.

But revising what we need to do, I can prove it.

What we need to calculate K are the []s of chemicals involved. These can only be applied to aqueous solutions or gases only, right? Have you ever had a concentration of any solids? This is because the 'concentration' of a solid is preserved all the time. Taking a crystal of salt as an example. The number of molecules of NaCl/ the volume that crystal occupies = constant, yeah? Because even if adding more salt into an already concentrated solution, the extra settles to the bottom, joining the solid particles. And since the density of solid salt is the same at certain temperature and pressure, 'the concentration' is also the same. The more salt you add, the larger volume it occupies with the more molecules in there.

Yea that makes sense.... thanks everyone