Using the regression equation, the concentration of a sample with absorbance of 0.25 is [tex]1.763 \times 10^{-5} M [/tex]
Using the regression equation obtained from the model :
- y = 15200x - 0.018
- y = Absorbance ; x = Concentration
The concentration of a sample of unknown dye with absorbance of 0.25 :
Substituting the the absorbance value, y = 0.25 into the equation and calculate the concentration, x :
0.25 = 15200x - 0.018
Add 0.018 to both sides
15200x = 0.25 + 0.018
15200x = 0.268
Divide both sides by 15200
x = (0.268 ÷ 15200)
x = [tex]1.763 \times 10^{-5} M[/tex]
Therefore, the concentration of a sample with absorbance of 0.25 is [tex]1.763 \times 10^{-5} M [/tex]
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