What is Normality? And what is molality?

Question

Accepted Answer

Normality is the concentration of a solution expressed as the number of equivalents of solute per liter of solution. Molality is the concentration of a solution expressed as the number of moles of solute per kilogram of solvent.

Normality is a measure of the number of reactive species in a solution.
It is expressed in terms of equivalents per liter of solution.
Molality is a measure of the concentration of a solution in terms of the number of moles of solute per kilogram of solvent.
It is independent of temperature and pressure.
For example, a 1 M solution of HCl is also a 1 N solution, but a 1 M solution of NaOH is a 2 N solution because it has two equivalents of OH- per mole.
A 1 molal solution of NaCl contains 1 mole of NaCl per kilogram of water.

Accepted Answer

Molality is ratio of the moles of solute to the kilogram of solvent.

The number of gram equivalent weight of a solute into one litre of a solution is called as Normality.

What is Normality? And what is molality?

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