Prelab 9: Due at the start of Lab 9

Name:________________________   Lab day________

Show all work, even simple addition and include unitsand sig figs where applicable.

1. To make solutions for the Beer's Law graph, you are providedwith a 49.9 ppm Allura Red solution. You pipet 10.00 mL of thissolution into a test tube and then you pipet 20.00 mL of deionizedwater into the same tube. After stirring, what is the Allura Redconcentration of the new solution you've made? This is Allura RedDilution 1.

V _final =

C _final =

1. If you pipet 10.00 mL of the solution you made in Question #1into a test tube and then you pipet 10.00 mL of deionized waterinto the same tube. After stirring, what is the Allura Redconcentration of the new solution you've made? Hint: use at least 2extra significant figures from your answer toquestion #1 to calculate this answer to avoid rounding errors. Yourfinal answer will be reported to the correct number of sf. This isAllura Red Dilution 2.

V _final =

C _final =

1. If you pipet 10.00 mL of the solution you made in Question #2into a test tube and then you pipet 10.00 mL of deionized waterinto the same tube. After stirring, what is the Allura Redconcentration of the new solution you've made? Hint: use at least 2extra significant figures from your answer toquestion #2 to calculate this answer to avoid rounding errors. Yourfinal answer will be reported to the correct number of sf. This isAllura Red Dilution 3.

V _final =

C _final =

1. To make solutions for the Density of KCl graph, you areprovided with a 12.0% KCl solution. You pipet 30.00 mL of thissolution into a test tube and then you pipet 10.00 mL of deionizedwater into the same tube. After stirring, what is the KClconcentration of the new solution you've made? This is KCl 2solution.

V _final =

C _final =

1. To make solutions for the Density of KCl graph, you areprovided with a 12.0% KCl solution. You pipet 20.00 mL of thissolution into a test tube and then you pipet 20.00 mL of deionizedwater into the same tube. After stirring, what is the KClconcentration of the new solution you've made? This is KCl 3solution.

V _final =

C _final =

1. To make solutions for the Density of KCl graph, you areprovided with a 12.0% KCl solution. You pipet 10.00 mL of thissolution into a test tube and then you pipet 30.00 mL of deionizedwater into the same tube. After stirring, what is the KClconcentration of the new solution you've made? This is KCl 4solution.

V _final =

C _final =

1. Using the equation of the line in the graph below, calculatethe concentration of Allura Red (in ppm) of the Buckeye-ade samplewhich has an absorbance of 0.415 a.u.

y= 0.0494x

R^2= 0.9861