5. o -7 points TCCGenC 5.PRE.005. 0/3 Submissions Used My Notes For Part A of th

Question

5. o -7 points TCCGenC 5.PRE.005. 0/3 Submissions Used My Notes For Part A of the Equilibrium experiment, you will be preparing several standard solutions for the Beer's Law plot. Using the information given in the Worksheet for Investigation 5, answer the following questions. (a) what is the initial Fe 3+ concentration of all of the solutions? (b) what is the initial scNi concentrations of Solutions #1A #5A? Solution 1A M Solution #2A M Solution 3A Solution #4A M Solution #5A M (c) What is the final concentration of FesCN in Solution #1A? You may wish to note these results on your lab worksheet, as they will be used in preparing your calibration curve. Supporting Materials Periodic Table Additional Materials LaWhat Is the Formation Constant for iron(l)thiocyanate?

Explanation / Answer

From the given data,

(a) Initial [Fe3+] in all solutions

= 0.1 M x 1 ml/6 ml

= 0.0167 M

(b) Initial SCN- in,

solution #1A = 5 x 10^-4 M x 1 ml/6 ml = 8.33 x 10^-5 M

solution #2A = 5 x 10^-4 M x 1.5 ml/6 ml = 1.25 x 10^-4 M

solution #3A = 5 x 10^-4 M x 2 ml/6 ml = 1.67 x 10^-4 M

solution #4A = 5 x 10^-4 M x 2.5 ml/6 ml = 2.08 x 10^-4 M

solution #5A = 5 x 10^-4 M x 3 ml/6 ml = 2.5 x 10^-4 M

(c) final concentration of [FeSCN]2+ in solution #1A

= 8.33 x 10^-5 M

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