You may tell when a solution os formed when the item or particle, such as sugar or salt, dissolves completely in the solvent, such as water.
Basically, you know when a solution is formed when the material you have placed in the solvent disappears :P
When the solute is completely dissolved into the solvent.
A solution is formed when a solute completely dissolves in a solvent, creating a homogeneous mixture. This mixture appears uniform, does not settle over time, and remains stable. Examples include sugar dissolving in water or salt in water, where you can no longer see the solid particles in the liquid.
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