Isotonic saline is 0.89% NaCl (w/v). Suppose you wanted to make 1.0 L of isotonic solution of NH₄Cl. What mass of NH₄Cl would you need? A) 1.6 g B) 8.1 g C) 8.9 g D) 54 g

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Quizplus · Accepted Answer

To make an isotonic solution, the osmotic pressure must be the same. Since 0.89% NaCl is isotonic, it has the same osmotic pressure as 0.89 g/100 mL or 8.9 g/L. NH4Cl has a similar molar mass to NaCl, so you need approximately the same mass, which is 8.1 g/L for NH4Cl.

Isotonic Saline Is 0