SHOW ALL THE WORK TO GET FULL CREDIT 15. Calculate the concentration (M) of sodium ions in a solution made by diluting 50.0 mL of a 0.874 M solution of sodium sulfide to a total volume of 250.0 mL diluting to 725 mL? Hint: first calculate molarity of Fel 17. What are the spectator ions in the reaction between KCl (aq) and AgNO, (ag)? 18. A 650 mL sodium bromide solution has a bromide ion concentration of 0.245 M. What is the mass (g) of sodium bromide in solution? 19. What is the concentration (M) of a NaCl solution prepared by dissolving 9.3 g of NaCl in sufficient water to give 350 mL of solution?