(DA) Feb 22, 2011: Solution Stoichiometry

Solutions

• Solutions are homogenous mixtures composed of a solute and a solvent
  - Solute is the chemical present in lesser amount (whatever is dissolved)
  - Solvent is the chemical present in greater amount (whatever does the dissolving)
• Chemicals dissolved dissolved in water are aqueous
  - NaCl(aq); H2SO4(aq)

Molarity

• Concentration can be expressed in many different ways
  - g/L, ml/L, % by volume, % by mass, mol/L
• The most common (In Chemistry 11 & 12) is mol/L which is also called Molarity
  - mol/L = M
  - [HCl] = concentration of HCl
  
  Molarity = Moles
                  Volume 

Examples:

• What is the concentration of Sodium Chloride solution made from 0.75 mol of NaCl dissolved in 250 mL of water
  
  0.75 mol = 3.0 mol/L                or 3.0 M
  0.250 L