what is the difference between molarity & molality?

Asked by sahabya | 31st May, 2010, 10:13: AM

Expert Answer:

Molality (m) is the number of moles of solute present in 1kg of solvent

Molarity (M) is the number of moles of solute present in 1L of solution

In 1 molar solution, 1 mole of solute is present in 1000 g of solvent whereas in 1 molar solution, 1 mole of solute is present in 1000 mL of solution. Solution is made up of solvent and solute. Hence in 1 molar solution amount of solvent is less. Hence its concentration is more.

Hence 1 molar solution is more concentrated than 1 molal solution.

Answered by  | 31st May, 2010, 10:42: AM

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