Question

Which one is better – Molarity or Molality - for determining concentration of solutions? Why

Answer 1

• Molality is better than the molarity concentration in chemistry praCtical calculation because Concentrations in molality (moles of solute per kilograms of solvent) are independent of temperature and pressure whereas concentrations in molarity (moles of solute per total volume of solution in liters) are not.

• Molality is considered better for expressing the concentration as compared to molarity because the molarity changes with temperature because of expansion or contraction of the liquid with temperature.But molality does not changes with temperature because the mass of the solvent does not change with change in temperature.

• The density of pure water at room temperature i.e., 25∘C is 0.9970749 g/mol, therefore the mass will be 0.9970749 kg, and the molecular mass is 18.0148 g/mol. The molality is 55.510 m.

Answer 2

Answer:

Molality is considered better for expressing the concentration as compared to molarity because the molarity changes with temperature because of expansion or contraction of the liquid with temperature.But molality does not changes with temperature because the mass of the solvent does not change with change in temperature.

Explanation:

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