Problem: The total concentration of dissolved particles in blood is 0.30 M. An intravenous (IV) solution must be isotonic with blood, which means it must have the same concentration.(b) If isotonic saline (NaCl) is used, what is the molarity of the solution?

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Isotonic means it must have the same concentration as the dissolved particles in blood. The total concentration of dissolved particles in blood is 0.30 M. 

Recall that NaCl will break up into its ions in a solution (particles): NaCl → Na+ + Cl- 

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The total concentration of dissolved particles in blood is 0.30 M. An intravenous (IV) solution must be isotonic with blood, which means it must have the same concentration.

(b) If isotonic saline (NaCl) is used, what is the molarity of the solution?

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Our data indicates that this problem or a close variation was asked in Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition. You can also practice Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition practice problems.