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Ch.18 - Chemistry of the Environment
All textbooksBrown 14th EditionCh.18 - Chemistry of the EnvironmentProblem 37
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Chapter 18, Problem 37

What is the molarity of Na+ in a solution of NaCl whose salinity is 5.6 if the solution has a density of 1.03 g>mL?

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Molarity

Molarity is a measure of concentration defined as the number of moles of solute per liter of solution. It is expressed in units of moles per liter (mol/L). To calculate molarity, one must know the amount of solute and the total volume of the solution. In this case, understanding how to convert salinity into moles of NaCl is essential for determining the molarity of Na+.
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Salinity

Salinity refers to the concentration of dissolved salts in water, typically expressed in parts per thousand (ppt) or grams per liter (g/L). In this context, a salinity of 5.6 indicates that there are 5.6 grams of NaCl per liter of solution. This value is crucial for calculating the number of moles of NaCl, which directly relates to the concentration of Na+ ions in the solution.

Density

Density is defined as mass per unit volume and is typically expressed in grams per milliliter (g/mL) or kilograms per liter (kg/L). The density of the solution (1.03 g/mL) is important for converting the mass of the solution into volume, which is necessary for calculating molarity. Understanding how to use density to find the total volume of the solution helps in determining the concentration of Na+ ions.
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