What is the difference between Osmolality and Osmolarity? - ProProfs Discuss
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What is the difference between Osmolality and Osmolarity?

Asked by Juul , Last updated: Jul 23, 2020

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Isabel Mathew

Coding is my forte plus writing and sharing my experiences online is one of my favorite hobbies.

Isabel Mathew, Software engineer, BS(Bachelor of Science), Austin,Texas

Answered Jul 23, 2020

Osmoles are a unit of osmotic pressure. Osmolality and osmolarity are two terms related to osmoles. Osmolarity is a term to explain the amount of osmotic concentration that a solution has. It is very difficult to determine osmolarity, because things like pressure and temperature can affect it. Osmolality determines how the dissolved solutes are concentrated.

It can also determine the amount of particles in fluid. One key difference between the two is that Osmolality is not affected by anything and it does not change. Another difference is that osmolality is much easier to determine than osmolarity is. Along with that, they are measured differently. Osmolality is measured in KG, while osmolarity is measured in L.

 

N. Jarah

N. Jarah

Answered Jul 20, 2020

When you say osmolarity, you should realize that this pertains to the number of particles that you can find in a solute for every liter of the solution that you can get. When you say osmolality, this means that you are pertaining to the number of particles that can be found in the solute for every kilogram of the solvent that you are trying to measure. Take note that a lot of people prefer osmolality over osmolarity, probably because this is very useful for the aqueous solutions that should be measured very soon. Osmolarity is also known to come with a little bit more volume, which can make things more complicated for those who are trying to measure the number of particles available.
 

Millie Brown

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Millie Brown, Businessman, Bachelor of Science in Business (BSBA), Nevada,Texas

Answered Jul 13, 2020

Osmolality and osmolarity are two terms that are used to measure the amount of osmoles of solute present in a kilogram of solvent, and the number of osmoles that 1 liters of a solution contains, respectively. The term that explains the osmotic concentration of a solution is known as osmolarity, and it is expressed as osmoles of solute per liter of solution.

Osmolality and osmolarity are two terms that are used to measure the amount of osmoles of solute
At times, to determine the osmolarity of a solution can be very difficult since its volume is usually affected by any change in temperature and pressure, and it also changes when more solutes are added. Osmolality, on the other hand, is used to determine the concentration of the dissolved solutes or particles in a fluid. Unlike the volume of osmolarity that changes by the addition of more solutes, the volume of osmolality does not change regardless of any factor; as a result, the osmolality of a solution can be easily determined. The unit of osmolality is Osm/Kg, whereas the unit of osmolarity is Osm/L.

 

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