Solution Stoichiometry and Molarity

Solutions:

• Solutions are homogeneous mixtures composed of a solute and solvent
• Solute is the chemical present in lesser amount (whatever is dissolved)
• Solvent is the chemical present in the greater amount (whatever does the dissolving)
• Chemicals dissolved in water are aqueous
• NaCl(aq); H2O4(aq)

Molarity:

• Concentration can be expressed in many different ways
•  g/L, mL/L % by volume, % by mass, mol/L
• The most common one we use is mol/L which is also called Molarity
• mol/L = M
• [NaCl] = concentration of HCl

Example:

• 0.250mol of H2SO4 in 250 mL water

               0.250mol x 1/0.250L = 1mol/L

• 0.118mol of water in 2.50L

                0.118mol x 1/2.50L = 0.0472mol/L

Molarity Video:

- George Spencer