3. Why molality is considered better for expressing the concentration as compared to molarity?
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Molality depends on mass of solvent whereas molarity depends upon volume of solution,volume of solution changes with temperature but mass remains same therefore Molality is considered better for expressing concentration.
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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.
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