Done by: Michelle, Amira & Kaylene
Chemistry
cause I had to.
amount of solute
(mol)
conc (mol/dm^3) x vol (dm^3)
The Concentration of a Solution
Concentration - The amount of solute in grams or moles that is dissolved in 1dm^3 of solution.
Concentration Formula : amount of solute ( mol )
volume of solution ( dm^3)
Unit of Concentration : mol/dm^3
THE CALCULATION TRIANGLE
MOLAR SOLUTION :
A solution that contains 1 mole of solute per dm^3
Calculations of concentrations:
Example 1:
What is the concentration of a solution containing 15 moles in a 3dm^3 of solution?
Answer: Concentration = 15 mol/3dm^3 = 2M/dm^3
Example 2 :
Solution A Solution B
Contains 2.5g of copper(II) Contains 125g ofcopper(II)
sulfate in 1dm^3 of H2O. sulfate in 0.5dm^3 of H20.
The conc. is 2.5g/dm^3 The conc. is 250g/dm^3.
Q: Find the conc. of Solution A and B above in MOLES PER DM^3.
Formula of Copper(II) Sulfate: CuSO4.5H2O.
The Mr of CuSO4.5H2O is 250.
SOLUTION A:
Firstly, change the mass of solute to moles so;
2.5g = 1 dm^3
Solution A : 1/(250/2.5)= 0.01 moles
Answer: Conc. = 0.01 mol/dm^3
Solution C :
250g = 1 dm^3
250g = 1 mole
Answer : Conc. = 250/250 = 1 M/DM^3
REMEMBER!!
AND
mass volume
÷Ar x24
xAr ÷ 24
mole