In the laboratory a student combines 267 mL of a 0206 M sodi

In the laboratory a student combines 26.7 mL of a 0.206 M sodium carbonate solution with 29.4 mL of a 0.318 M sodium chloride solution.

What is the final concentration of sodium cation ?

Solution

final concentration of Na+ =( millimoles of Na+ from Na2CO3 + millimoles of Na+ from NaCl ) / total volume

                                          =( 2 x 26.7 x 0.206 + 29.4 x 0.318) / (26.7 + 29.4)

                                          = 0.363 M

final concentration of sodium cation = 0.363 M