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What is a solution that can dissolve no more than solute?
Such a solution is called is called unsaturated solution. In such a solution the salt dissolved hasn't reached the level of saturation. Also, more solute can be dissolved if temperature is increased...
This depends on what state the solute is in. Solubility depends upon temperature. If the solute is a solid you can generally heat the solution and more solute will dissolve. If the solute is a gas...