We learned that a solution is a homogeneous mixture. In a solution, there is a solute and solvent. A solute is the component present in smaller amount, a solvent is the component present in a smaller amount. Concentration (con'c) is amount of solute / amount of solvent.
The possible units for concentration are g/mL, g/L, mg/L, % by mass, % by volume, etc..
- mol / L = molarity
Concentration is found by using C = n / v
- C = concentration
- n = number of moles
- v = volume
- Example -: Bob dissolves 38.0 g of NaOH in enough water to make 200.0 mL of solution. Find the molarity.
- [NaOH] = ? - first find the molar mass which is 40.0g
- find the amount of moles by dividing the mass of NaOH by its molar mass: 40.0g / 38.0g = 1.05 mol
- find the molarity in mol/L: (1.05 mol x 1000mL) / (200 mL x 1 L) = 5.25 mol / L
That is all. Mr. Doktor is the best!
-- done by Jael Lumba
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