Calculate the sodium ion concentration when 71.8 mL of 3.2 M sodium carbonate is added to 33.6 mL of 3.7 M sodium bicarbonate.
mols Na2CO3 = M x L = ?
mols Na^2+ = twice that from Na2CO3.
mols NaHCO3 = M x L = ?
mols Na^+ = 1x that from NaHCO3.
Add mols Na^+ from Na2CO3 to mols Na^+ from NaHCO3. Then total mols Na^+/total L of solution = M Na^+
Note: total volume in L is (71.8+33.6)/1000 = ?L