In gasoline or diesel fuel

High gum level/ sediment in gasoline or diesel fuel... 

What does this mean First, observe that this simple theory of solubility uses no information about the solvent. The above theoretical calculation is for any solvent. If the solute (NaCl in this case) does not interact with the solvent, then this may be a fair estimate. The reported solubility of NaCl in ethanol at 25°C is 0.00025 mol fraction, 1.7 times the value calculated above. If we wanted to know the solubility of NaCl in gasoline or diesel fuel, with which it would not be expected to interact much, the 0.00014 mol fraction computed in Example 11.13 would be a fair estimate. However, we know that water and NaCl interact strongly. The salt ionizes, the ions solvate with the water molecules. We may think of their interaction as a strong example of type HI (Section 8.4.3) with a calculated activity coefficient of 0.000,14. All of the salts that dissolve to high concentrations in water are similar to NaCl in this behavior. 

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