Question

1. When 27 mL of a 230 mL stock solution containing1.8999999999999997 M BaF2 is diluted to 81 mL, what is theconcentration of F- in the new solution?

2. A 210 mL stock solution contains 0.9 M Ca(CN)2. When 103 mL ofthe stock solution is diluted to 130 mL, how many moles of CN- ionswill be contained in the dilute solution?

3. A stock solution is prepared by adding 30 mL of 1.5 M NaNO2 toenough water to make 45 mL. How many moles of NO2- are in 40 mL ofthe stock solution?