Calculate the number of grams of NaCl needed to prepare 100 mL of a 280 mOsm/L N

Question

Calculate the number of grams of NaCl needed to prepare 100 mL of a 280 mOsm/L NaCl solution. (The molecular weight of NaCl is 58) show detailed steps in your calculations. Calculate the number of grams of glucose is 180) show detailed steps in your calculations. If you placed 3 grams of glucose and 2 grams of NaCl into a graduated cylinder and added enough distilled water to make a 1-lier solution, what is the total osmolarity of this solution in mOsm/L? Show your detailed calculation below: Based on your calculation, a____% NaCl solution and a ____% glucose solution are isotoni to one another.

Explanation / Answer

A solution of 1 mol/L NaCl has an osmolarity of 2 Osmol/L.

Osmolarity of 0.140 mol/L NaCl is 0.280 Osmol/L or 280 mOsmol/L or

58 grams in 1 liter gives 1molar solution and 0.140 molar in 100 ml need 812 milligrams of NaCl.

Glucose has same osmolarity as molarity so 5 grams is requried as 180 grams required for 1liter solution for 1molar

Glucose with 3 grams in 1000 ml will give 16mM or 16 Osm/ L solution and 34 mM of NaCl is formed from 2 grams in 1liter of water and will be multiplied by two to get the 68 Osm/L solution and the mixture will have 84 mOsm/L.

A 1.2% solution (w/v) of NaCl is isotonic with 7.2% of glucose

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