In a double replacement reaction resulting in the formation of solid calcium carbonate, the resulting supernatant would be described as .
a) saturated with CaCO3
b) containing no ions of CaCO3
c) supersaturated with CaCO3
d) unsaturated with CaCO3
I know it's a, but I don't understand why.

a) saturated with CaCO3, because when maximum solute gets dissolve to form precipitate as when solute is saturated with solvent and then precipitates hence the supernatant is saturated with CaCO3.

Explanation:

In double displacement reaction two ionizable compounds exchange their cation or anion forming an insoluble compound that is precipitate. The supernatant will be the solvent and dissolved solute.

We know that precipitation is formed when solubility of the compound exceeds to that of other.

The solubility occurs when it exceeds the saturation in the solution.

So, the precipitate has overcome the saturation in solvent, the resulting supernatant is saturated with CaCO3 or the solute.

answer: at room temperature (roughly 20 degrees c), you can dissolve 203.9 grams (or 200 grams) of sugar in 100 ml of water. as water temperature increases, the amount of sugar that will dissolve increases, up to about 500 grams of sugar in 100 ml water at 100 degrees c.

explanation:

the mantle

explanation:

earth is divided into three layers: the crust or the outermost layer on which we live; the underlying, middle layer - the mantle - and the core (the innermost layer of earth).