The normal saline solution of 0.90% (w/v) NaCl is a relatively dilute aqueous solution. What is...

Question:

The normal saline solution of 0.90% (w/v) NaCl is a relatively dilute aqueous solution. What is the molarity of normal saline?

Molarity


Molarity (M) is a measure of the concentration of a solution in terms of the number of moles of solute per liter of the solution with the unit symbol mol/L.

{eq}c = n \div V {/eq}

Where n is the amount of the solute in moles, V is the volume of solution in liters, c is the molarity.


Answer and Explanation:


The molarity of normal saline is 0.154 mole per litre, which is 0.154 M.

The normal saline solution contains 9 g NaCl in 1 L solution. The molar mass of NaCl = 58.44 g/mol,

{eq}n = 9 \div 58.44 = 0.154 mol {/eq}

{eq}c = 0.154 \div 1 = 0.154 mol/L {/eq}


Learn more about this topic:

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What is Molar Mass? - Definition, Formula & Examples

from General Studies Science: Help & Review

Chapter 27 / Lesson 24
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