1. calculate the volume of concentrated HNO_3 (68%)that is needed to prepare stock solution 0.25M in 1000mL volumetric flask. (density HNO_3 = 1.513 g/cm^3)

2. from above stock solution, determine volume needed to dilute to 500mL volumetric flask that contained 10 times dilution.

1 answer

See your post above. After seeing how to do the first part you should be able to do the second part.