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Molar solution

• Molar (M) is a unit of concentration of a substance, or more correctly, solute in solution.
  
  
• A one molar solution consists of one mole (1M) of a substance or solute per liter of solution.
  
  i.e. a one molar solution (1M) of a substance is the concentration achieved by dissolving one mole of that substance (solute) in water (H₂O) and bringing the final solution up to a volume of 1 L
  
  
• The concentration of a molar solution or moles per litre (mol/L) is represented by the symbol M