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Cal Concentration

Key Concepts

  • weight/volume percentage concentration is usually abbreviated as w/v (%)
  • w/v (%) = mass solute ÷ volume solution × 100%
  • common units are g/100mL (%)

Example

What is the weight/volume percentage concentration of 200mL of aqueous sodium chloride solution containing 5g NaCl?

Calculate the weight/volume (%) = mass solute ÷ volume of solution × 100%

mass solute (NaCl) = 5g

volume of solution = 200mL

w/v (%) = 5g ÷ 200mL × 100%
              = 2.5g/100mL
              = 2.5%

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