Question

difference between molality and molarity.....​

Answer 1

Molarity is the concentration of moles per litres

whereas

Molality is the concentration of moles per kilogram

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Answer 2

Molality :

1. It is the ratio of moles of solute to the mass of solvent in kg .
2. It is denoted by m .
3. Its SI unit is mol/kg .
4. It is not affected by the change in temperature and pressure because only mass is involved .

Molarity :

1. It is the ratio of moles of solute to the volume of solution in litres .
2. It is denoted by M .
3. Its SI unit is mol/ l .
4. It is affected by temperature and pressure because of the involvement of volume that changes with change in physical conditions .

Molarity and Molality are two ways of finding the concentration of a solution . Since Molality is not affected by changes in physical factors , it is more accurate and precise than molarity .

Some other ways of finding concentration :

• Mass percentage
• V/V percentage
• Normality
• ppm
• mole fraction