Question

Prelab 9: Due at the start of Lab 9 Name: Lab day Show all work and include units and sig figs where applicable. 1. To make solutions for the Beer's Law graph, you are provided with a 49.9 ppm Allura Red solution. You pipet 10.00 mL of this solution into a test tube and then you pipet 20.00 mL of deionized water into the same tube. After stirring, what is the Allura Red concentration of the new solution you've made? This is Allura Red Dilution 1. V final Cfinal = 2. If you pipet 10.00 mL of the solution you made in Question #1 into a test tube and then you pipet 10.00 mL of deionized water into the same tube. After stirring, what is the Allura Red concentration of the new solution you've made? Hint: use at least 2 extra significant figures from your answer to question #1 to calculate this answer to avoid rounding errors. Your final answer will be reported to the correct number of sf. This is Allura Red Dilution 2. V final = C final =

Answer 1

1. We have VIG= V2 C2 or 10 mL * 49,9 ppm = 30ml x C op.C2 = (104499 ) = 16.63 ppm IV = Initial volume = 10 mL v = Final volume (10+20) = 30ml 4 = Initial concentration | C2 = Final con 49.9 ppm 30 Vfinal =30ml C final = 16.63 bpm , .