How can I calculate osmolarity of blood?

Answer 1

You multiply the molarity of each solute by the number of osmoles that it produces.

After that, you combine them.

One mol of particles that contribute to a solution's osmotic pressure is known as an osmole (Osm).

One mole of NaCl becomes two osmoles in solution: one mole of Na⁺ and one mole of Cl⁻, for example, when it completely dissociates in water to form Na⁺ and Cl⁻ ions.

The osmolarity of a solution containing 1 mol/L of NaCl is 2 Osm/L.

The osmolarity of a solution containing 1 mol/L CaCl₂ is 3 Osm/L (1 mol Ca²⁺ and 2 mol Cl⁻).

AN EXAMPLE

The solute concentrations are as follows: [Na2] = 0.140 mol/L; [glucose] = 180 mg/100 mL; and [BUN] (blood urea nitrogen) = 20 mg/100 mL. Determine the osmolarity of the blood.

Resolution

However, each Na+ ion pairs with a negative ion X-, such as Cl-, to produce two Osm of particles. This is why [Na+] = 0.140 mol/L.

∴ NaX osmolarity = #(0.140" mol")/(1" L") × (2" Osm")/(1" mol")# = 0.280 Osm/L

Osmolarity of glucose =

#(0.150" g")/(100" mL") × (1000" mL")/(1" L") × (1" mol")/("180.2 g") × (1" Osm")/(1" mol")# = 0.008 32 Osm/L
BUN osmolarity = #(0.020" g")/(100" mL") × (1000" mL")/(1" L") × (1" mol")/(28.01" g") ×(1" Osm")/("1 mol")# = 0.0071 mol/L

∴ Osmolarity of blood = (0.280 + 0.008 32 + 0.0071) Osm/L = 0.295 Osm/L = 295 mOsm/L

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Answer 2

The osmolarity of blood can be calculated by summing the concentrations of all solutes present in the blood, including electrolytes and other dissolved substances, and then expressing the total concentration in osmoles per liter (osmol/L) or milliosmoles per liter (mOsm/L). This calculation typically involves measuring the concentrations of sodium, potassium, glucose, urea, and other solutes using laboratory tests, such as blood chemistry panels. Once the concentrations of these solutes are known, they are added together to determine the total osmolarity of the blood.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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