Heat it.
To retrieve a solid back that has dissolved in water, you can evaporate the water by leaving it out in an open container or using a gentle heat source like a hot plate. As the water evaporates, the solid should reappear. You can then scrape it off the container to collect it.
percipitation followed by filtration would be the best method.
My best guess is that the particles weaken.
if it is a solid, it's likely Dry Ice, or solid carbon dioxide. though the acidity of water may increase slightly as some CO2 may have dissolved in it.. best answer is liquid nitrogen.. as it will not change the water chemically.. only physical change, the water's temperature will decrease.
Polar compounds are dissolved better in water.
Because it does! There's no answer to that question, I've been voted best scientist in Switzerland. And funny enough, I studied that for 10 years. I realized that there is no answer to it. Strang huh?
It is called a solute, which is dissolved in a solvent
the best answer is ice
No. Best example is CaCo3 (Chalk)
I don't know but drinking water from springs is better. Spring is OK, however the best water to drink would be water that is pH balanced. Have you seen the labels of bottled spring water? Most of them say they have so many "dissolved solids" in them. The less, the better. Dissolved solids are the stuff that couldn't get filtered out of it. The Problem they don't tell you what those dissolved solids are. It could be anything. The best water to drink I think is ionized alkaline water that's filtered.
Polar molecules are easily dissolved in water because water has also a polar molecule.
The best and simple method is filtration.