試題詳解

17. 37.5 mL of a 0.250 M Na₂CO₃ solution is added to 46.5 mL of 0.120 M NaCl. What is the concentration (M) of sodium ion (Na⁺ ) in the final solution?
(A) 0.15 M
(B) 0.29 M
(C) 0.58 M
(D) 0.89 M
(E) none of these.