4. A copper(II) sulfate solution of unknown concentration is placed in a colorimeter and an absorbance reading of 0.46 is recorded. Using the same solution cell, a 0.055 M solution of copper(II) sulfate gives an absorbance reading of 0.34. What is the concentration of the first solution?
Answers
Answer:
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Answer :
The concentration of the first solution is 0.46 M.
Explanation :
To determine the concentration of the first solution, you can use the Beer-Lambert law, which states that the absorbance of a solution is directly proportional to its concentration and the length of the light path through the solution. The equation for the Beer-Lambert law is:
A = ε × b × c
where A is the absorbance, ε is the molar absorptivity, b is the length of the light path, and c is the concentration of the solution.
Since the molar absorptivity and the length of the light path are constant in this case, you can use the ratio of the absorbance readings to determine the ratio of the concentrations.
0.46/0.055 = c/0.055
Solving for c, you get:
c = 0.46 × 0.055 / 0.055 = 0.46 × 1 = 0.46
So, the concentration of the first solution is 0.46 M.
To know more about the concept please go through the links :
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