Answer:
Explanation:
Given parameters :
Volume of solution = 100mL
Absorbance of solution = 0.30
Unknown:
Concentration of CuSO₄ in the solution = ?
Solution:
There is relationship between the absorbance and concentration of a solution. They are directly proportional to one another.
A graph of absorbance against concentration gives a value of 0.15M at an absorbance of 0.30.
The concentration is 0.15M
Also, we can use: Beer-Lambert's law;
A = ε mC l
where εm is the molar extinction coefficient
C is the concentration
l is the path length
Since the εm is not given and assuming path length is 1;
Then we solve for the concentration.
The concentration of the sample with the absorbance of 0.3 has been 0.15 M.
The absorbance has been measured with the liquid samples. The impure sample has been prepared with the distilled water dilution to 100 ml. The techniques have resulted in the spectrum of Absorbance versus concentration.
With the graph obtained, the absorbance and concentration depict the linear relationship. With the increase in concentration, there has been an increase in absorbance. The graph shows that at the absorbance at 0.3, the concentration of the sample has been 0.15M.
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