As a solution of NaCl becomes more concentrated, does the difference between its molarity and it

step 1 As we know that molarity is equal to number of moles of salute divided by volume of solution in

As a solution of NaCl becomes more concentrated, does the...

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Key Concepts

Molality

Molality is a concentration unit defined as the number of moles of solute per kilogram of solvent. Unlike molarity, molality is based on the mass of the solvent rather than on the volume of the solution, making it independent of temperature, and less affected by changes in density.

Density and Volume-Mass Relationship

The difference between molarity and molality arises because molarity is based on the total solution volume that includes both solute and solvent, while molality depends solely on the weight of the solvent. As a solution becomes more concentrated, the addition of solute increases the solution’s density, which means that the same mass of solvent occupies a smaller volume. This growing discrepancy leads to an increased difference between the two concentration units in more concentrated solutions.

Molarity

Molarity is a concentration unit defined as the number of moles of solute per liter of solution. This measurement depends on the total volume of the mixture, which means it is sensitive to temperature and the density of the solution because the volume can change based on these factors.

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