Concentration of Solutions: Molarity, Molality and Normality Molarity (M) Molarity is the number of moles of solute per liter of solution. It is typical...
Concentration of Solutions: Molarity, Molality and Normality
Molarity (M)
Molarity is the number of moles of solute per liter of solution. It is typically expressed in moles per liter (M) or moles per liter (mol/L).
Molality (m)
Molality is the number of moles of solute per kilogram of solvent. It is typically expressed in moles per kilogram (m) or mol/kg.
Normality (N)
Normality is the number of moles of solute per liter of solution. It is typically expressed in moles per liter (N) or mol/L.
Differences between Molarity, Molality and Normality:
Molarity: A measure of the number of moles of solute per liter of solution.
Molality: A measure of the number of moles of solute per kilogram of solvent.
Normality: A measure of the number of moles of solute per liter of solution.
Examples:
Molarity: A solution of 1 mole of sodium chloride (NaCl) dissolved in 1 liter of water has a molarity of 1 M.
Molality: A solution of 0.1 mol of sodium chloride in 1 kg of water has a molality of 0.1 m.
Normality: A solution of 10 mol of sodium chloride in 1 L of water has a normality of 10 N.
Key Points:
Concentration is a measure of the amount of solute in a given volume of solution.
Different concentrations are used for different purposes, such as determining the purity of a substance, assessing the concentration of a drug in a patient's blood, or calculating the amount of solute in a chemical reaction.
Molarity, molality, and normality are all equal to each other when the concentration is expressed in the same units