Now try this calculation: In the calculations above, you\'ve shown how you conve

Question

Now try this calculation: In the calculations above, you've shown how you convert from grams % molality osmolality Use MW Use dissociation factor Now use the reverse order to solve this problem Calculate how many grams of table salt (NaCI) you'd need to put in 100ml of distilled water to make an isotonic saline solution (300mOsmolal) for an IV bottle. Of course, we'll need to sterilize it after you've made it! (If you already know the "answer," still show your work, demonstrating how you arrive at the answer.)

Explanation / Answer

Osmolality formula = 2 x [Na]                       [here 2 use for dissociating factor for Sodium]

The Na is sodium concentration in mmol/l

Now we have been provided Osmolality =300 mOsmolal,

Volume in litre = 100ml÷ 1000L =0.1L

Now by putting the values in the formula-

300 = 2 × mmol/ 0.1

Now mmol = 300 ×0.1 ÷2

Mmol = 15

Therefore, we have 15mmol of Na for the 300mosmol solution

Now the weight of Na we needed can calculate by molar formula-

Mass = moles × molecular weight of NaCl

Mass = 15 × 10-3 × 58

Mass = 870 × 10-3 g

Mass = 0.87g or 870mg of NaCl

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