Final answer:
Solution concentration units such as molarity, percentage, ppm, ppb, and molality are used to express the amount of solute in a given solution. To convert between units, one may need the molar mass of the solute and the density of the solution. An example calculation shows how to determine the number of moles of solute in a solution based on its molarity.
Step-by-step explanation:
Understanding Solution Concentration Units
To understand the various concentration units used to describe the amount of solute in a solution, it is important to recognize that concentration can serve as a conversion factor in stoichiometry problems. Concentration units such as molarity, percentage, parts per million (ppm), parts per billion (ppb), and molality have specific applications based on the context of the problem.
Molarity is defined as moles of solute per liter of solution and is very useful in chemical reactions. To convert between units, one may need to know the molar mass of the solute and the density of the solution. As an example, if we have a 0.887 M NaCl solution, and we want to know how many moles of solute are in 0.108 L of this solution, we would multiply 0.108 L by 0.887 mol/L, which results in approximately 0.0958 moles of NaCl.