Answer:
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Molarity |
Molality |
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Molarity of a given solution is defined as the total number of moles of solute per litre of solution. |
Molality is defined as the total moles of a solute contained in a kilogram of a solvent. |
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Mathematical expression is M = number of moles of the solute /Volume of solution given in terms of litres. |
Mathematical expression is m = Numbers of moles of solute/Mass of solvent in kgs m = (g ✕ 1000)/(W ✕ m). |
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Depends on volume of the whole solution. |
Depends on the mass of the solvent. |
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Unit sign expressed as (M). |
Unit sign expressed as (m). |
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Molarity has a unit of moles/liter. |
Molality has units of moles/kg. |
The relationship between the molarity (M) and molality (m) is expressed as below.
\(m= frac{1000times M}{1000times (d-M)times M^{‘}}\)M = Molarity.
m= Molality.
M’ = Molar mass of the solute.