Can a solution with undissolved solute be supersaturated?



Answer:
No, it's only saturated. If you have any solute left anything dissolved beyond the saturation level of the solvent would crash out. The undisolved solute is a seed and the excess solute will crash out
Yes. At a given temperature and pressure, there is a practical limit to how supersaturated a solution can become. Beyond that concentration, you get undissolved solute.

Example: no matter how careful you are, you cannot dissolve 5 kilos of sugar in a glass of water. It will supersaturate, and then you will start getting a syrupy sludge with crystallization in it.
I think so by adjusting temperature and pressure
If you try to stir it and slightly heat it, and if it dissolves, then it is probably not supersaturated. To make a solution supersaturated, you need to dissolve more solute than what the liquid can hold at a given temperature, heat it to a higher temperature and then cool it fast to prevent the precipitation of the excess solute.
Lancenigo di Villorba (TV), Italy

MY OWN IS :"NO, IT DOESN'T!".

DEFINITIONs
AN AQUEOUS SOLUTION is a Physical-Chemical System where Water acts as Solvent against a Solute (e.g. Salt).
Since Solution results as an HOMOGENEOUS SYSTEM, there isn't any difference inside itself.
Usually, you form a Salt's Aqueous Solution by dissolving some Salt's Spoons or few more matter in Deionized Water : it will result an UNSATURATED SOLUTION since it will dissolve more other salt-spoons.
The Dissolvement's Power would stop when you proceed to add increasing Salt's Amounts or YOU DIMINUTE SOLUTION's TEMPERATURE.
The latter fashion may lead to SATURATED SOLUTIONs or SUPERSATURATED ONEs : the former are EQUILIBRIUM's SYSTEMs, the second ones aren't.
So, in order to form SATURATED SOLUTIONs you may obtain undissolved solute.

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In order to form SUPERSATURATED SOLUTIONs you have to use FREEZE APPARATUS to avoid any EQUILIBRIUM PHENOMENA, e.g. the crystalization-germs : if precipitation occurs, you will obtain not SUPERSATURATED SYSTEMs.
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I hope this could be clear.

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