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Answer :
Final answer:
To calculate the osmolarity of D5NS solution with 30 mEq KCl IV/L in milliosmoles per liter, calculate the osmolarity of dextrose and sodium chloride, then add them together.
Explanation:
To calculate the osmolarity of the intravenous fluid D5NS with 30 mEq KCL IV/L in milliosmoles per liter, we need to add up the osmolarity of each component. D5NS is a mixture of dextrose (glucose), sodium chloride (NaCl), and other components. First, we calculate the osmolarity of the dextrose using its molarity and the molar mass of glucose. Then, we calculate the osmolarity of the sodium chloride by converting the mEq/l to mmol/l using the molar mass of NaCl. Finally, we add up the osmolarities of both components to get the total osmolarity of the solution.
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The osmolarity of D5NS with 30 mEq KCl IV/L is approximately 645.4 mOsm/L.
What is osmolarity?
We have from the question;
Osmolarity contributed by dextrose: 0.2774 mol/L * 1,000 mOsmol/mol = 277.4 mOsm/L
Osmolarity contributed by sodium chloride: 0.154 mol/L * 2 (since NaCl dissociates into 2 ions in water) * 1,000 mOsmol/mol = 308 mOsm/L
Osmolarity contributed by potassium chloride: 0.03 mol/L * 2 (since KCl dissociates into 2 ions in water) * 1,000 mOsmol/mol = 60 mOsm/L
Sum the osmolarities contributed by each component:
277.4 mOsm/L (dextrose) + 308 mOsm/L (sodium chloride) + 60 mOsm/L (potassium chloride) = 645.4 mOsm/L
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