Solution Chemistry Example 4

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Example 4

medium
A student dissolves 3535 g of NaCl in 100100 g of water at 25°C25°\text{C}. The solubility of NaCl at 25°C25°\text{C} is 36 g per 100 g water36\,\text{g per 100 g water}. Is this solution saturated, unsaturated, or supersaturated?

Solution

  1. 1
    The solution contains 3535 g of NaCl per 100100 g of water. The solubility limit is 3636 g per 100100 g water.
  2. 2
    Since 35<3635 < 36, the solution has not reached its maximum capacity. It is unsaturated — more NaCl could still dissolve.

Answer

Unsaturated (35 g < 36 g solubility limit)\text{Unsaturated (35 g < 36 g solubility limit)}
To determine saturation, compare the actual amount of dissolved solute to the solubility at that temperature. If the dissolved amount equals the solubility, the solution is saturated.

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A homogeneous mixture formed when one or more solutes are completely dissolved in a solvent at the molecular level, resulting in a uniform composition throughout.

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