A true solution is monophasic without any residue..
Molality of a solution remains constant as mass of a solution independent of temperature.
Supernatant.
The concentration of the SO42- ion that remains in solution after the reaction is complete is determined by the stoichiometry of the reaction and the initial concentration of the reactants.
The concentration of Na ion that remains in solution after the reaction is complete is determined by the stoichiometry of the reaction and the initial concentration of Na ions.
If the spill occurs after solution of the salt is complete, the concentration of the solution left in the container remains unchanged, because by definition of solution, the amounts of solvent and solute spilled will have the same proportions as in the original solution.
No, it is not true.
This is called supersaturation. It occurs when a solution contains more solute than it can normally hold at a given temperature, and when the solution cools down, the excess solute remains dissolved until disturbed.
If more solute is added to the solution and the solute remains undissolved, then you know that solution is saturated.
The number of moles of solute will not change. Too, the molarity of the solution decreases.
Sulfuric acid remains active in a solution indefinitely, as it does not degrade or lose its potency over time.
after the solvent is taken away the solute still remains
When a large amount of solvent is added to a concentrated solution, the concentration of the solution decreases. This process is known as dilution. The overall volume of the solution increases, but the amount of solute remains the same.