Question

Calculate the percentage composition of Sodium Carbonate (Na2CO3). List and explain the steps you need to calculate this.

Answer 1

Answer:

Ba2+ and Cl-

Cu2+ and SO42-

K+ and Cr2O72-

To work out the concentration.

If there is only one ion produced then the concentration equals the concentration of the solution. ie for the Ba2+, only one ion is liberated so the concentration is 0.17M.

If more than one ion is liberated ie Cl- in BaCl2 then you multiply the concentration of the solution by the number of ions liberated. ie for the Cl- example; for every molecule of BaCl2 dissolved two Cl- ions are liberated so that the concentration of the Cl- ion is 2*0.17 or 0.34M

Explanation: