Concentration Chemistry Example 1

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Example 1

easy
Calculate the molarity of a solution made by dissolving 5.855.85 g of NaCl in water to make 500 mL500\,\text{mL} of solution. (NaCl molar mass = 58.44 g/mol58.44\,\text{g/mol})

Solution

  1. 1
    Moles of NaCl =5.8558.44=0.100 mol= \frac{5.85}{58.44} = 0.100\,\text{mol}.
  2. 2
    Volume in liters =500 mL=0.500 L= 500\,\text{mL} = 0.500\,\text{L}.
  3. 3
    Molarity =nV=0.1000.500=0.200 M= \frac{n}{V} = \frac{0.100}{0.500} = 0.200\,\text{M}.

Answer

0.200 M0.200\,\text{M}
Molarity (MM) is the most common concentration unit in chemistry. It measures moles of solute per liter of solution, not per liter of solvent.

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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Example 5 easy

What is the molarity of a solution made by dissolving [formula] mol of [formula] in enough water to

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