A researcher creates the Beer\'s Law plot shown and uses it to analyze an unknow

Question

A researcher creates the Beer's Law plot shown and uses it to analyze an unknown solution. She finds the unknown has an absorbance of 0.40. What is the concentration of solute in the unknown solution? 0.028 M 0.028 g/L 0.040 g/L 0.052 g/L Consider the following reaction: Q + R rightarrow S 15.0 mL of a 2.10 M solution of "Q" and 12.0 mL of a 1.50 M solution of "R" are mixed together. The concentration of S in the new, combined solution is found to be 0.37 M. What is the magnitude of the equilibrium constant (K) for this system? 5.28 0.189 0.639 0.117 1.57

Explanation / Answer

23. Use the slope of line shown in Beer’s Law plot to find the equation of line and put Y = 0.40 in the calculated equation to find the value of required X (concentration of solute in unknown solution).

24.

Equilibrium constant (K) for the system :-

K = [S] / [Q]*[R] = 0.37 / (2.10*1.50)

K = 0.117

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