A student mixes 675 mL of water and 256 mL of 3.30 x 10-5 M orangefood dye solution. What is the concentration of this new dilute solution of orange food dye?
you are diluting it (675+256)/256 times, or 3.64 times....which means, one part original, and 2.64 parts water added.
new concentration: 3.3E-5/3.64 M