Concentration Chemistry Example 3

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Example 3

medium
Calculate the molarity of a solution made by dissolving 5.85 g of NaCl (molar mass 58.5 g/mol) in enough water to make 500 mL.

Solution

  1. 1
    Convert the mass of NaCl to moles: n=mM=5.85 g58.5 g/mol=0.100 moln = \frac{m}{M} = \frac{5.85\,\text{g}}{58.5\,\text{g/mol}} = 0.100\,\text{mol}
  2. 2
    Convert the volume from mL to L: V=500 mL=0.500 LV = 500\,\text{mL} = 0.500\,\text{L}
  3. 3
    Calculate the molarity: M=nV=0.100 mol0.500 L=0.200 MM = \frac{n}{V} = \frac{0.100\,\text{mol}}{0.500\,\text{L}} = 0.200\,\text{M}

Answer

The molarity of the NaCl solution is 0.200 M0.200\,\text{M}.
Molarity (MM) is defined as moles of solute per liter of solution. The key steps are: convert mass to moles using molar mass, convert volume to liters, then divide moles by volume.

About Concentration

The quantity of solute dissolved per unit volume of solution, most commonly expressed as molarity (MM) in units of moles per liter (mol/L).

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